Answer Posted / shwetha kamath

function validate_user_editadvanced_form_username(element)
{var valid = "0123456789"
var ok = "yes";
var temp;
for (var i=0; i<element.value.length; i++) {
temp = "" + element.value.substring(i, i+1);
if (valid.indexOf(temp) == "-1") ok = "no";
}
if (ok == "no") {
alert("Invalid entry! Only numbers are accepted!");
element.focus();
element.select();
}
}

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