add IE version check to gradeA qualifier.

Author: scottjehl

js/jquery.mobile.core.js

@@ -55,7 +55,16 @@
 
 		//support conditions that must be met in order to proceed
 		gradeA: function(){
-			return $.support.mediaquery;
+			
+			//non-UA-based IE version check by James Padolsey, modified by jdalton - from http://gist.github.com/527683
+			//allows for inclusion of IE 6+, including Windows Mobile 7
+			var ie = (function() {
+			    var v = 3, div = document.createElement('div'), a = div.all || [];
+			    while (div.innerHTML = '<!--[if gt IE '+(++v)+']><br><![endif]-->', a[0]); 
+			    return v > 4 ? v : !v;
+			}());
+		
+			return $.support.mediaquery || ie && ie >= 6;
 		},
 
 		//TODO might be useful upstream in jquery itself ?