if (document.images) {
    aup       = new Image();
    aup.src   = "/images/nl-off.jpg" ;
    adown     = new Image() ;
    adown.src = "/images/nl-on.jpg" ;
	
	bup       = new Image();
    bup.src   = "/images/de-off.jpg" ;
    bdown     = new Image() ;
    bdown.src = "/images/de-on.jpg" ;
	
	cup       = new Image();
    cup.src   = "/images/en-off.jpg" ;
    cdown     = new Image() ;
    cdown.src = "/images/en-on.jpg" ;
	
	dup       = new Image();
    dup.src   = "/images/pl-off.jpg" ;
    ddown     = new Image() ;
    ddown.src = "/images/pl-on.jpg" ;
	
	eup       = new Image();
    eup.src   = "/images/it-off.jpg" ;
    edown     = new Image() ;
    edown.src = "/images/it-on.jpg" ;	
				
								
}
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" );
    }
}