Risolto!
la funzione principale diventa questa!
codice:
function high(which2)
{
theobject=which2
highlighting=setInterval("highlightit(theobject)",30)
}
function low(which2)
{
clearInterval(highlighting)
highlighting=setInterval("lowlightit(theobject)",10)
// which2.filters.alpha.opacity=20
}
function highlightit(cur2)
{
if (cur2.filters.alpha.opacity<100)
cur2.filters.alpha.opacity+=5
else if (window.highlighting)
clearInterval(highlighting)
}
function lowlightit(cur2)
{
if (cur2.filters.alpha.opacity>50)
cur2.filters.alpha.opacity-=5
else if (window.highlighting)
clearInterval(highlighting)
}