<!--
if (document.images) {
    zerobuttonup       = new Image();
    zerobuttonup.src   = "images/links-zero.jpg" ;
    zerobuttondown     = new Image() ;
    zerobuttondown.src = "images/links-zero-hover.jpg" ;

    onebuttonup       = new Image();
    onebuttonup.src   = "images/links-one.jpg" ;
    onebuttondown     = new Image() ;
    onebuttondown.src = "images/links-one-hover.jpg" ;

    twobuttonup       = new Image();
    twobuttonup.src   = "images/links-two.jpg" ;
    twobuttondown     = new Image() ;
    twobuttondown.src = "images/links-two-hover.jpg" ;
    
    threebuttonup       = new Image();
    threebuttonup.src   = "images/links-three.jpg" ;
    threebuttondown     = new Image() ;
    threebuttondown.src = "images/links-three-hover.jpg" ;

    fourbuttonup       = new Image();
    fourbuttonup.src   = "images/links-four.jpg" ;
    fourbuttondown     = new Image() ;
    fourbuttondown.src = "images/links-four-hover.jpg" ;

    infobuttonup       = new Image();
    infobuttonup.src   = "images/links-info.jpg" ;
    infobuttondown     = new Image() ;
    infobuttondown.src = "images/links-info-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" );
    }
}
// -->