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<pre>
<IMG style="-moz-opacity:0.6" src="alta.gif" onMouseover="this.style.MozOpacity=1" onMouseout="this.style.MozOpacity=0.6">
</pre>
*For CSS opacity to work in the browser it must have some placement specified. Mozilla recommends that we use float:left; and position:relative; to work in Mozilla Firefox. The opacity code for simply displaying an image is more straightforward.
<pre>
<span style="float:left;filter:alpha(opacity=25);-moz-opacity:.25;opacity:.25;"><img src="v90.gif" width="50" height="50"></span>
</pre>
