writing/calling a function

I’ve written the following function the check whether or not a required field is empty upon form submission:

[CODE] $.fn.checkRequired = function(){
return this.each(function(){
if (this.val()==”){
$(“<div class=’error’>some error message</div>”).insertAfter(‘this’);
};
});
};
[/CODE]

I then check on submission like this:

[CODE] $(‘form’).submit(function(){
return $(‘form.required’).checkRequired();
});
[/CODE]

I’m not sure if I’m not calling the function correctly or if the function has problems (or both). Any ideas on how I might do this?

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