Update IE checker code for compiler

Author: eddiemonge

js/jquery.mobile.support.js

@@ -52,13 +52,17 @@ function baseTagTest() {
 // allows for inclusion of IE 6+, including Windows Mobile 7
 $.mobile.browser = {};
 $.mobile.browser.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;
+    var undef,
+        v = 3,
+        div = document.createElement('div'),
+        all = div.getElementsByTagName('i');
+    
+    while (
+        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
+        all[0]
+    );
+    
+    return v > 4 ? v : undef;
 })();