Been playing around with JavaScript, and what Im trying to do is only allow certain characters in the pass word field - a-z, A-Z and 0-9.

<form action=http://www.cknuckles.com/cgi/echo.cgi method=get name=logOn>

  User Name:<br />

  <input type=text name=userName size=25 /><br />

  Password:<br />

  <input type=password name=pw size=25 /><br />

  <input type=submit value=Log In onClick=validate()/> 

</form>

Above is my HTML, and Below is my JavaScript I tried to use to validate it - but it doesnt work - any clues.

<script language=javascript>

   document.logOn.onsubmit=validate;



   function validate(){



var name=document.logOn.pw.value;

    if(!name = [a-zA-Z0-9]){              

alert(Your Password Cant Have Any Funky Things In It - Play It Straight!);

    return false;

}               



    return true;

}

</script>

But This isnt working. I can still put chars in like * and [ and { etc.

Any Thoughts?