Change Text Box Color using Required Field Validator. No Extender Controls Please

Question

I need to change color of TextBox whenever its required field validator is fired on Clicking the Submit button

Answer 1

I had to make a few changes to Steve's suggestion to get mine working,

 function ValidateTextBox(source, args) {
    var controlId = document.getElementById(source.controltovalidate).id;
    var control = $("#" + controlId);
    var value = control.val();
    var is_valid = value != "";
    is_valid ? control.removeClass("error") : control.addClass("error");
    args.IsValid = is_valid;
  }

great example though, exactly what I needed.