Alpha grafiki w JavaScript

<p align="center">
<SCRIPT>
function high(which2)
{
 theobject=which2
 highlighting=setInterval("highlightit(theobject)",30)
}
function low(which2)
{
 clearInterval(highlighting)
 if (which2.style.MozOpacity)
  which2.style.MozOpacity=0.3
 else if (which2.filters)
 which2.filters.alpha.opacity=30
}

function highlightit(cur2){
if (cur2.style.MozOpacity<1)
cur2.style.MozOpacity=parseFloat(cur2.style.MozOpacity)+0.1
else if (cur2.filters&&cur2.filters.alpha.opacity<100)
cur2.filters.alpha.opacity+=10
else if (window.highlighting)
clearInterval(highlighting)
}
</SCRIPT>
</p>
<p align="center">
<a href="http://www.maksite.net/">
<img onmouseover='high(this)' style='FILTER: alpha(opacity = 30); moz-opacity: 0.3' onmouseout='low(this)'
width='400' heigth='50' src='upload/image/maksite.jpg' border="0"></a>
</p>