Form validation works in Firefox but not IE..

https://mcbits.com/~donation/online-appraisal-form-test.php is the URL.

I cannot figure out why it won't work in IE. I have another form almost exactly like it that works fine.

Any help guys?

- Jon

 

  if (theForm.model.value == "")
  {
    alert("Please enter your vehilcle's model.");
    theForm.x_first_name.focus();
    return (false);
  }

Code (markup):

replace x_first_name with model