Does anyone know if there is a way to check for an active popup window blocker?

I understand the need for a blocker, but I wished there was a way the blocker would work as if Javascript was turned off.

For example, in a photo gallery a link to an enlargement:

Code:
<a href="link_to_picture" title="name" onclick="opnWin(this,width,height,this.title);return false;">[thumbnail]</a>
If Javascript is turned off, the enl. picture can still be viewed since the link can be followed. But if JS is turned on and a blocker is active, nothing happens at all.

Would it not be better, if the browser would still follow the link, but ignore the Javascript? It does have access to the script after all.