function isBlank(s) {
    var len = s.length;
    var i;
    for (i = 0; i < len; ++i) {
        if (s.charAt(i) != " ") return false;
    }
    return true;
}

function validatefrm(frm) {
    if (isBlank(frm.phone_number1.value) == true) {
        alert("Account Number field not to be left Blank")
        frm.phone_number1.focus();
        return false;
    }
    if (isBlank(frm.security_code.value) == true) {
        alert("Security Code Not to be left Blank")
        frm.security_code.focus();
        return false;
    }

    var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";

    for (var i = 0; i < document.MyForm.phone_number1.value.length; i++) {
        if (iChars.indexOf(document.MyForm.phone_number1.value.charAt(i)) != -1) {
            alert("Special Characters are not allowed in Account Number field!");
            return false;
        }
    }

    for (var i = 0; i < document.MyForm.security_code.value.length; i++) {
        if (iChars.indexOf(document.MyForm.security_code.value.charAt(i)) != -1) {
            alert("Special Characters are not allowed in Password field!");
            return false;
        }
    }

    frm.action = "Myaccount.aspx"
}