if (document.images) {
   	peoplebuttonup       	= new Image();
    peoplebuttonup.src   	= "images/nav_people.gif" ;
    peoplebuttondown     	= new Image() ;
    peoplebuttondown.src 	= "images/nav_people_on.gif" ;
	
	servicesbuttonup       	= new Image();
    servicesbuttonup.src   	= "images/nav_services.gif" ;
    servicesbuttondown     	= new Image() ;
    servicesbuttondown.src 	= "images/nav_services_on.gif" ;
	
	sectorsbuttonup       	= new Image();
    sectorsbuttonup.src   	= "images/nav_sectors.gif" ;
    sectorsbuttondown     	= new Image() ;
    sectorsbuttondown.src 	= "images/nav_sectors_on.gif" ;
	
	clientsbuttonup       	= new Image();
    clientsbuttonup.src   	= "images/nav_clients.gif" ;
    clientsbuttondown     	= new Image() ;
    clientsbuttondown.src 	= "images/nav_clients_on.gif" ;
	
	jobsbuttonup       		= new Image();
    jobsbuttonup.src   		= "images/nav_jobs.gif" ;
    jobsbuttondown     		= new Image() ;
    jobsbuttondown.src 		= "images/nav_jobs_on.gif" ;
	
	contactbuttonup       	= new Image();
    contactbuttonup.src   	= "images/nav_contact.gif" ;
    contactbuttondown     	= new Image() ;
    contactbuttondown.src 	= "images/nav_contact_on.gif" ;
	
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}