efeito opacidade com imagens

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primeiro código: coloque-o entre as tag <.head>
<style type="text/css"> #im { FILTER: alpha(opacity=50) } </style><br /> <br /> <script language="JavaScript1.2"> function high(which2) { theobject=which2; highlighting=setInterval("highlightit(theobject)",50); } function low(which2) { clearInterval(highlighting); which2.filters.alpha.opacity=50; } function highlightit(cur2) { if(cur2.filters.alpha.opacity<100) cur2.filters.alpha.opacity+=5 else if(window.highlighting) clearInterval(highlighting) } </script>

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segundo código: coloque-o entre as tag <.body>
<img id="im" src="sua imagem aqui" onmouseover="high(this)" onmouseout="low(this)">

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