function varCheck(obj, s_type, message) {
        var obj_len = 0;
        obj_len = tRealLen(obj.value);

        if (obj_len < 1) {
                alert(message);
                return true;
        }

        if (s_type == 1) {
                if (obj.value.search(/^(\S+)@(\S+)\.(\S+)$/) == -1) {
                        alert("Your email address has wrong format. Please make a correction");
                return true;
                }
        } else if (s_type == 2) {
                if (obj.value.search(/^([0-9a-zA-Z]+)$/) == -1) {
                        alert("Please enter 6~12 characters, alpha numeric only");
                return true;
                }
        }

}

function tRealLen(s) {           
        var n = 0;
        for (var i = 0; i < s.length; i++) {
                if (escape(s.charAt(i)).length > 3) {
                        n += 2;
                }else{
                        n++;
                }
        }
        return n;
}