Question

I there a way to show popup texts while clicking the youtube video iframe code ?

<a href='login.html?sid=0&keepThis=true&TB_iframe=true&height=240&width=650' class="thickbox" title='test'>

Answer 1

Have you try to call Javascript on the onclick attribute

<a onclick="alert('test')"
  href='login.html?sid=0&keepThis=true&TB_iframe=true&height=240&width=650' class="thickbox" title='test' >

This will open the pop up and then go to the URL (tested on Firefox 7).

Edit: Another solution is to do the href location after the pop up :

<a onclick="alert('test');document.location.href='login.html?sid=0&keepThis=true&TB_iframe=true&height=240&width=650'" 
  class="thickbox" title='test'>