How do I validate an online form?

[Melissa De Luca]

Hello,

I am trying to validate a form using dreamweaver cs3. I am doing so using behaviors, however I do not have the option to validate "onSubmit"? I am very new to web design, however I have used this option before.

Can anyone tell me why this option is missing and if I can get it back?s

Also, can I validate lists, and menus within my form using behavoirs?

[Bharat383]

<script type="text/javascript">
function valid()
{
 if(document.getElementById("firstname").value == "")
   {
         alert("First Name is empty  !!!");
        return false;
    }
  if(document.getElementById("mobile").value == "")
    {
       alert("Enter Mobile Number !!!!");
       return false;
     }
}
</script>

<form name="form1" onSubmit = "return valid()">
First Name :: <input type="text" id="firstname" name="firstname" value="">
<br>
Mobile :: <input type="text" id="mobile" name="mobile" value="">
<br>
<input type="submit" name="submit" value="Submit"> 
</form>

Bharat Parmar(Bharat38 3)