<!--
if (document.images) {
    onebuttonup       = new Image();
    onebuttonup.src   = "images/link01.jpg" ;
    onebuttondown     = new Image() ;
    onebuttondown.src = "images/link01-hover.jpg" ;

    twobuttonup       = new Image();
    twobuttonup.src   = "images/link02.jpg" ;
    twobuttondown     = new Image() ;
    twobuttondown.src = "images/link02-hover.jpg" ;

    threebuttonup       = new Image();
    threebuttonup.src   = "images/link03.jpg" ;
    threebuttondown     = new Image() ;
    threebuttondown.src = "images/link03-hover.jpg" ;
    
    fourbuttonup       = new Image();
    fourbuttonup.src   = "images/link04.jpg" ;
    fourbuttondown     = new Image() ;
    fourbuttondown.src = "images/link04-hover.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" );
    }
}
// -->