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Try:
<SCRIPT LANGUAGE="JavaScript"><!--
function validated(string) {
for (var i=0, output='', valid="123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; i<string.length; i++)
if (valid.indexOf(string.charAt(i)) != -1)
output += string.charAt(i)
return output;
}
//--></SCRIPT>
<FORM>
<INPUT TYPE="TEXT" onChange="this.value=validated(this.value)">
</FORM>