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Try the following:
<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 replaceFormFields(what,text,by) {
for (var i=0; i<what.elements.length;i++) {
if (what.elements[i].name.indexOf('text') != -1)
what.elements[i].value = replace(what.elements[i].value,text,by);
}
}
//--></script>
<script language="JavaScript1.1"><!--
function replaceFormFields(what,text,by) {
for (var i=0; i<what.elements.length;i++) {
if (what.elements[i].type == 'text' || what.elements[i].type == 'textarea')
what.elements[i].value = replace(what.elements[i].value,text,by);
}
}
//--></script>
<form>
<input name="text1" type="text" value="x xx xxx xx x">
<br><textarea name="text2">x xx xxx xx x</textarea>
<p><input type="button" onClick="replaceFormFields(this.form,'x','y')">
</form>