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The following should work on Netscape Navigator 4+ and Internet Explorer 4+:
<body onLoad="textWidth()">
<script language="JavaScript"><!--
function textWidth() {
if (document.layers)
alert('width = ' + document.layers['nn'].document.width);
else if (document.all)
alert('width = ' + document.all['msie'].clientWidth);
}
//--></script>
<div id="msie">
<layer id="nn">
How long is this string?
</layer>
</div>