Efekt alpha w JavaScript
<script language="JavaScript1.2">
function makevisible(cur,which){
strength=(which==0)? 1 : 0.2
if (cur.style.MozOpacity)
cur.style.MozOpacity=strength
else if (cur.filters)
cur.filters.alpha.opacity=strength*100
}
</script>
<img src="maksite.jpg" style="filter:alpha(opacity=20);-moz-opacity:0.2" onMouseover="makevisible(this,0)" onMouseout="makevisible(this,1)">