[jQuery] event binding on dynamically created elements? stumped

[jquertil]

Hello...

I'm creating an input element like this:

        $(this).after('<input type="text" name="symptom"
                          value="Enter Symptom" class="focusClear"/
>');

then I want to clear the value on focus like so:

        $('.focusClear').focus(function(){
                $(this).val('');
        });

Obviously this doesnt work cine jquery doesnt know about the element
yet. Do I need to write it as an extension?

Thanks!