thickbox and jquery validation problem

[eluser]quest13[/eluser]
When I use the following code, jquery validation works.(jquery.validation.js)

Code:

"<a href="&lt;?=$url;?&gt;?height=400&width=600" title="Add Image for Product" id="idpro"  class="thickbox"><b>Add Image</b></a>"

But, when I use

Code:

"<a href="&lt;?=$url;?&gt;?TB_iframe=true&height=400&width=600" title="Add Image for Product" id="idpro"  class="thickbox"><b>Add Image</b></a>"

It doesn't work.I mean, it doesn't prompt any message. I need iframe as I want to navigate further to other pages.

Any help please ?