diff --git a/lib/coder.js b/lib/coder.js
index 5dece25..b3623d4 100644
--- a/lib/coder.js
+++ b/lib/coder.js
@@ -85,8 +85,8 @@ var ICEcoder = {
 			ICEcoder.content.style.height = (winH-headerH-footerH-tabsBarH-findBarH) + "px";
 
 			// Resize the CodeMirror instances to match the window size
-			document.all ? strCSS = 'rules' : strCSS = 'cssRules';
 			cMCSS = ICEcoder.content.contentWindow.document;
+			cMCSS.styleSheets[2].rules ? strCSS = 'rules' : strCSS = 'cssRules';
 			cMCSS.styleSheets[2][strCSS][1].style['width'] = ICEcoder.content.style.width;
 			cMCSS.styleSheets[2][strCSS][1].style['height'] = ICEcoder.content.style.height;
 			cMCSS.styleSheets[2][strCSS][2].style['width'] = ICEcoder.content.style.width;
@@ -1119,7 +1119,7 @@ var ICEcoder = {
 	getMouseXY: function(e) {
 		var tempX, tempY, scrollTop, IE;
 
-		IE = document.all ? true : false;
+		IE = !e.pageX ? true : false;
 		if (IE) {
 			top.ICEcoder.mouseX = e.clientX + document.body.scrollLeft;
 			top.ICEcoder.mouseY = e.clientY + document.body.scrollTop;
@@ -1517,8 +1517,8 @@ var ICEcoder = {
 		}
 
 		// Show visible tabs or not
-		document.all ? strCSS = 'rules' : strCSS = 'cssRules';
 		cMCSS = ICEcoder.content.contentWindow.document;
+		cMCSS.styleSheets[2].rules ? strCSS = 'rules' : strCSS = 'cssRules';
 		visibleTabs ? cMCSS.styleSheets[2][strCSS][5].style['content'] = '"\\21e5"' : cMCSS.styleSheets[2][strCSS][5].style['content'] = '" "';
 
 		top.tabWidth = tabWidth;