Adding test for IE9 in iframes

Internet Explorer 9 supports css3 media queries, but not within frames
(this appears to be a bug in IE9). Modifying this script to check for
IE9 and check if within iframe and run if true.

README.md

@@ -4,7 +4,7 @@
  - Copyright 2011: Scott Jehl, scottjehl.com
  - Dual licensed under the MIT or GPL Version 2 licenses. 
 
-The goal of this script is to provide a fast and lightweight (3kb minified / 1kb gzipped) script to enable [responsive web designs](http://www.alistapart.com/articles/responsive-web-design/) in browsers that don't support CSS3 Media Queries - in particular, Internet Explorer 8 and under. It's written in such a way that it will probably patch support for other non-supporting browsers as well (more information on that soon).
+The goal of this script is to provide a fast and lightweight (3kb minified / 1kb gzipped) script to enable [responsive web designs](http://www.alistapart.com/articles/responsive-web-design/) in browsers that don't support CSS3 Media Queries - in particular, Internet Explorer 8 and under (and IE9 when inside a frame). It's written in such a way that it will probably patch support for other non-supporting browsers as well (more information on that soon).
 
 If you're unfamiliar with the concepts surrounding Responsive Web Design, you can read up [here](http://www.alistapart.com/articles/responsive-web-design/) and also [here](http://filamentgroup.com/examples/responsive-images/)
 

respond.src.js

@@ -42,7 +42,7 @@ window.matchMedia = window.matchMedia || (function(doc, undefined){
 	respond.mediaQueriesSupported	= win.matchMedia && win.matchMedia( "only all" ).matches;
 
 	//if media queries are supported, exit here
-	if( respond.mediaQueriesSupported ){ return; }
+	if( respond.mediaQueriesSupported && !isIE9iframe() ){ return; }
 
 	//define vars
 	var doc 			= win.document,
@@ -323,4 +323,12 @@ window.matchMedia = window.matchMedia || (function(doc, undefined){
 	else if( win.attachEvent ){
 		win.attachEvent( "onresize", callMedia );
 	}
+  //test for IE9 iframe	
+  function isIE9iframe() {
+	  var ua = navigator.userAgent,
+	  	ie_version = -1;
+	  var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
+	  if (re.exec(ua) != null) ie_version = parseFloat( RegExp.$1 );
+	  return ( window != window.top && ie_version >= 9.0 );
+	}
 })(this);