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Try the following which is set for aacute, eacute, iacute, oacute, uacute:
<FORM NAME="test">
<INPUT TYPE="TEXT" NAME="output" SIZE="60">
<INPUT TYPE="BUTTON" VALUE="Convert" onclick="doit()">
</FORM>
<SCRIPT LANGUAGE="JavaScript"><!--
function replace(string,text,by) {
// Replaces text with by in string
var strLength = string.length, txtLength = text.length;
if ((strLength == 0) || (txtLength == 0)) return string;
var i = string.indexOf(text);
if ((!i) && (text != string.substring(0,txtLength))) return string;
if (i == -1) return string;
var newstr = string.substring(0,i) + by;
if (i+txtLength < strLength)
newstr += replace(string.substring(i+txtLength,strLength),text,by);
return newstr;
}
function doit() {
text = document.test.output.value;
text = replace(text,'a/',unescape('%E1'));
text = replace(text,'e/',unescape('%E9'));
text = replace(text,'i/',unescape('%ED'));
text = replace(text,'o/',unescape('%F3'));
text = replace(text,'u/',unescape('%FA'));
document.test.output.value = text;
}
//--></SCRIPT>