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function setEnd(field) {
if (field.createTextRange) {
var r = field.createTextRange();
r.moveStart('character', field.value.length);
r.collapse();
r.select();
}
}
<INPUT TYPE="text" name="userName" value="²âÊÔ" onfocus="setEnd(this)">
<INPUT TYPE="text" name="userAge" value="²âÊÔ" onfocus="setEnd(this)">
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