function on(ch){
 theobject=ch; highlighting=setInterval("highlightit(theobject)",50);
}

function off(ch){
 clearInterval(highlighting); ch.filters.alpha.opacity=50;
}

function highlightit(cur){
 if(cur.filters.alpha.opacity<100) cur.filters.alpha.opacity+=10;
 else if(window.highlighting) clearInterval(highlighting);
}