function high(which2){
theobject=which2
if (window.downlighting) clearInterval(downlighting)
highlighting=setInterval("highlightit(theobject)",50)
}

function low(which2){
clearInterval(highlighting)
theobject=which2
downlighting=setInterval("downlightit(theobject)",50)
}

function highlightit(cur2){
if (cur2.filters.alpha.opacity<100)
cur2.filters.alpha.opacity+=10//淡出速度
else if (window.highlighting)
clearInterval(highlighting)
}

function downlightit(cur2){
if (cur2.filters.alpha.opacity>70)//原始透明度
cur2.filters.alpha.opacity-=10//淡入速度
else if (window.downlightit)
clearInterval(downlighting)
}