function showMenu(mnuNum)
    {
    
    switch( mnuNum )
    {
    
    case 1 : 
                document.frontpage.src='http://www.tunnelbuilder.com/buttons/home_buttondown.gif';
                showOnlyDiv(1);                          
//                document.getElementById('divSubMenu1').style.display = 'block';
                
            break;
            
    case 11 : 
                document.showdiary.src='http://www.tunnelbuilder.com/buttons/home_subbutton1_down.gif';
                document.getElementById('divSubMenu1').style.display = 'block';
                
            break;
            
    case 12 : 
                document.bookmark.src='http://www.tunnelbuilder.com/buttons/home_subbutton2_down.gif';
                document.getElementById('divSubMenu1').style.display = 'block';
                
            break;                        
    
    case 13 : 
                document.contactus.src='http://www.tunnelbuilder.com/buttons/resources_subbutton1_down.gif';
                document.getElementById('divSubMenu1').style.display = 'block';
                
            break;             
            
    case 2 :
                document.archive.src='http://www.tunnelbuilder.com/buttons/archive_buttondown.gif' ;
                showOnlyDiv(2);                          
             break;            
             
    case 21 : 
                document.archivesearch.src='http://www.tunnelbuilder.com/buttons/archive_subbutton1_down.gif';
                document.getElementById('divSubMenu2').style.display = 'block';
                
            break;  
            
    case 22 : 
                document.countryfiles.src='http://www.tunnelbuilder.com/buttons/archive_subbutton2_down.gif';
                document.getElementById('divSubMenu2').style.display = 'block';
                
            break;                                                 
            
    case 3 :
                document.referenc.src='http://www.tunnelbuilder.com/buttons/reference_buttondown.gif' ;
                showOnlyDiv(3);                          
             break;            
             
    case 31 : 
                document.heathandsafety.src='http://www.tunnelbuilder.com/buttons/reference_subbutton4_down.gif';
                document.getElementById('divSubMenu3').style.display = 'block';
                
            break;  
            
    case 32 : 
                document.magazines.src='http://www.tunnelbuilder.com/buttons/publications_subbutton3_down.gif';
                document.getElementById('divSubMenu3').style.display = 'block';
                
            break;                                                             
            
            
    case 33 : 
                document.tunneljournalists.src='http://www.tunnelbuilder.com/buttons/publications_subbutton4_down.gif';
                document.getElementById('divSubMenu3').style.display = 'block';
                
            break;                                                             
    case 34 : 
                document.tunnelmachines.src='http://www.tunnelbuilder.com/buttons/resources_subbutton6_down.gif';
                document.getElementById('divSubMenu3').style.display = 'block';
                
            break;  
            
    case 35 : 
                document.tunnelconsultants.src='http://www.tunnelbuilder.com/buttons/resources_subbutton4_down.gif';
                document.getElementById('divSubMenu3').style.display = 'block';
                
            break;                                                                                     

   case 36 : 
                document.wltp.src='http://www.tunnelbuilder.com/buttons/reference_subbutton3_down.gif';
                document.getElementById('divSubMenu3').style.display = 'block';
                
            break;                                  

    case 4 :
                document.recbreaker.src='http://www.tunnelbuilder.com/buttons/recordbreakers_buttondown.gif' ;
                showOnlyDiv(4);                          
             break;            
             
    case 41 : 
                document.halloffame.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton1_down.gif';
                document.getElementById('divSubMenu4').style.display = 'block';
                
            break;  
            
    case 42 : 
                document.chemofhrr.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton2_down.gif';
                document.getElementById('divSubMenu4').style.display = 'block';
                
            break;                                                                          
    case 43 : 
                document.cmdoferrs.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton3_down.gif';
                document.getElementById('divSubMenu4').style.display = 'block';
                
            break;  
            
    case 44 : 
                document.tdreams.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton4_down.gif';
                document.getElementById('divSubMenu4').style.display = 'block';
                
            break;                                                                                                  

    case 5 :
                document.supplier.src='http://www.tunnelbuilder.com/buttons/suppliers_buttondown.gif' ;
                showOnlyDiv(5);                          
             break;            
             
    case 51 : 
                document.production.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton1_down.gif';
                document.getElementById('divSubMenu5').style.display = 'block';
                
            break;  
            
    case 52 : 
                document.support.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton2_down.gif';
                document.getElementById('divSubMenu5').style.display = 'block';
                
            break;                                                                          
    case 53 : 
                document.transport.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton3_down.gif';
                document.getElementById('divSubMenu5').style.display = 'block';
                
            break;  
            
    case 54 : 
                document.lining.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton4_down.gif';
                document.getElementById('divSubMenu5').style.display = 'block';
                
            break;    
    case 55 : 
                document.safety.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton5_down.gif';
                document.getElementById('divSubMenu5').style.display = 'block';
                
            break;  
            
    case 56 : 
                document.formwork.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton7_down.gif';
                document.getElementById('divSubMenu5').style.display = 'block';
                
            break;    
            
    case 57 : 
                document.skills.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton6_down.gif';
                document.getElementById('divSubMenu5').style.display = 'block';
                
            break;           
            
    case 6 :
                document.jobs.src='http://www.tunnelbuilder.com/buttons/tunneljobs_buttondown.gif' ;
                showOnlyDiv(6);                          
             break;    
             
    case 7 :
                document.sales.src='http://www.tunnelbuilder.com/buttons/resources_buttondown.gif' ;
                showOnlyDiv(7);                          
             break;                                                  
            
     case 71 : 
                document.team.src='http://www.tunnelbuilder.com/buttons/team_down.gif';
                document.getElementById('divSubMenu7').style.display = 'block';
                
            break;      
			
    }
    
    
    
    }
    
    
    
        function hideMenu(mnuNum)
    {
    
    switch( mnuNum )
    {
    
    case 1 : 
                document.frontpage.src='http://www.tunnelbuilder.com/buttons/home_buttonup.gif';
                break;
    case 11 : 
                document.showdiary.src='http://www.tunnelbuilder.com/buttons/home_subbutton1_up.gif';
                break;
    case 12 : 
                document.bookmark.src='http://www.tunnelbuilder.com/buttons/home_subbutton2_up.gif';
                break;
    case 13 : 
                document.contactus.src='http://www.tunnelbuilder.com/buttons/resources_subbutton1_up.gif';
                break;
    case 2 : 
                document.archive.src='http://www.tunnelbuilder.com/buttons/archive_buttonup.gif';
                break;    
    case 21 : 
                document.archivesearch.src='http://www.tunnelbuilder.com/buttons/archive_subbutton1_up.gif';
                break;    
    case 22 : 
                document.countryfiles.src='http://www.tunnelbuilder.com/buttons/archive_subbutton2_up.gif';
                break;                        
    case 3 : 
                document.referenc.src='http://www.tunnelbuilder.com/buttons/reference_buttonup.gif';
                break;    
    case 31 : 
                document.heathandsafety.src='http://www.tunnelbuilder.com/buttons/reference_subbutton4_up.gif';
                break;    
    case 32 : 
                document.magazines.src='http://www.tunnelbuilder.com/buttons/publications_subbutton3_up.gif';
                break;                        
    
    case 33 : 
                document.tunneljournalists.src='http://www.tunnelbuilder.com/buttons/publications_subbutton4_up.gif';
                break;                        
    case 34 : 
                document.tunnelmachines.src='http://www.tunnelbuilder.com/buttons/resources_subbutton6_up.gif';
                break;    
    case 35 : 
                document.tunnelconsultants.src='http://www.tunnelbuilder.com/buttons/resources_subbutton4_up.gif';
                break;     
   
    case 36 : 
                document.wltp.src='http://www.tunnelbuilder.com/buttons/reference_subbutton3_up.gif';
                
            break;   
			
   case 4 : 
                document.recbreaker.src='http://www.tunnelbuilder.com/buttons/recordbreakers_buttonup.gif';
                break;    
    case 41 : 
                document.halloffame.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton1_up.gif';
                break;    
    case 42 : 
                document.chemofhrr.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton2_up.gif';
                break;                                                               
                
    case 43 : 
                document.cmdoferrs.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton3_up.gif';
                break;                                                               
    case 44 : 
                document.tdreams.src='http://www.tunnelbuilder.com/buttons/recordbreakers_subbutton4_up.gif';
                break;    
                
   case 5 : 
                document.supplier.src='http://www.tunnelbuilder.com/buttons/suppliers_buttonup.gif';
                break;    
                
    case 51 : 
                document.production.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton1_up.gif';
                break;                                    
                
    case 52 : 
                document.support.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton2_up.gif';
                break;                                                    
    case 53 : 
                document.transport.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton3_up.gif';
                break;                                                    
                                
    case 54 : 
                document.lining.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton4_up.gif';
                break;                                                    
                
    case 55 : 
                document.safety.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton5_up.gif';
                break;                                                                                                    
                
    case 56 : 
                document.formwork.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton7_up.gif';
                break;                                                                                                    
                
    case 57 : 
                document.skills.src='http://www.tunnelbuilder.com/buttons/suppliers_subbutton6_up.gif';
                break;                                                                                                                                    
   case 6 : 
                document.jobs.src='http://www.tunnelbuilder.com/buttons/tunneljobs_buttonup.gif';
                break;    
   case 7 : 
                document.sales.src='http://www.tunnelbuilder.com/buttons/resources_buttonup.gif';
                break;                    
   case 71 : 
                document.team.src='http://www.tunnelbuilder.com/buttons/team_up.gif';
                document.getElementById('divSubMenu7').style.display = 'block';
                
            break;                                                                                                          
    
    }
    
    
    
    }
    
    
    function hideSubMenuBar()
    {
         document.getElementById('divSubMenu1').style.display = 'none';
         document.getElementById('divSubMenu2').style.display = 'none';
         document.getElementById('divSubMenu3').style.display = 'none';
         document.getElementById('divSubMenu4').style.display = 'none';
         document.getElementById('divSubMenu5').style.display = 'none';
         document.getElementById('divSubMenu6').style.display = 'none';
         document.getElementById('divSubMenu7').style.display = 'none';                                    
    
    }
    
    function showOnlyDiv(divNum)
    {
        switch(divNum)
        {
        
        case 1 : 
                    hideSubMenuBar();
                    document.getElementById('divSubMenu1').style.display = 'block';
                    break;
        
        case 2 : 
                    hideSubMenuBar();
                    document.getElementById('divSubMenu2').style.display = 'block';        
                    break;
        case 3 : 
                    hideSubMenuBar();
                    document.getElementById('divSubMenu3').style.display = 'block';        
                    break;
                    
        case 4 : 
                    hideSubMenuBar();
                    document.getElementById('divSubMenu4').style.display = 'block';        
                    break;
        case 5 : 
                    hideSubMenuBar();
                    document.getElementById('divSubMenu5').style.display = 'block';        
                    break;
        case 6 : 
                    hideSubMenuBar();
                    document.getElementById('divSubMenu6').style.display = 'block';        
                    break;
        case 7 : 
                    hideSubMenuBar();
                    document.getElementById('divSubMenu7').style.display = 'block';        
                    break;                                                                                                    
                    
        }
    
    
    }