if (document.images) {
	homebuttonup       = new Image();
    homebuttonup.src   = "images/home1.gif" ;
    homebuttondown     = new Image() ;
    homebuttondown.src = "images/home2.gif" ;
    
	aboutbuttonup       = new Image();
    aboutbuttonup.src   = "images/about1.gif" ;
    aboutbuttondown     = new Image() ;
    aboutbuttondown.src = "images/about2.gif" ;

	contactbuttonup       = new Image();
    contactbuttonup.src   = "images/contact1.gif" ;
    contactbuttondown     = new Image() ;
    contactbuttondown.src = "images/contact2.gif" ;            
    
    servicesbuttonup       = new Image();
    servicesbuttonup.src   = "images/services1.gif" ;
    servicesbuttondown     = new Image() ;
    servicesbuttondown.src = "images/services2.gif" ; 

    resourcesbuttonup       = new Image();
    resourcesbuttonup.src   = "images/resources1.gif" ;
    resourcesbuttondown     = new Image() ;
    resourcesbuttondown.src = "images/resources2.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" );
    }
}