Return the screen width to a php variable

Hi,
I am not that good with JQuery so I am looking for a little help with this solution for an ad banner, this is for a free theme not a commercial venture!

I want to return the screen width with jquery back to a php variable when the page loads.

What I want to do is with a WordPress twenty eleven child theme, the theme is responsive but Google ads are not, it looks silly on a mobile if the banner is wider than the screen.

So only once when WordPress opens in a browser if we can get the screen width stored in a variable, then we can load a different adSense banner block based on the screen width.

If the page is opened in a mobile we can display a mobile sized banner.

I have been on google without much luck.

If we have a function something like this, how can we get the returned screen width from a JQuery call to a php variable?

This does not work!

This would be set in a php file, I need to get the screen width back from a JQuery function, if this can be done.


$dr_screen_width = 0; 

In a php file, or could go in a *.js file.


<script type="text/javascript">
(function($){
	$(document).ready(function () {
		var $dr_screen_width;
		$dr_screen_width = $(window).width();
	});
})(jQuery);
</script> 

Any help most welcomed.

Hopefully

David

The only is for the jQuery code to submit the information back to the page, which results in the page being called twice.
This can be done as a form submit, or you could set a cookie value and check to see if that cookie information exists.