diff --git a/lib/coder.js b/lib/coder.js
index 94b1f94..3d0a535 100644
--- a/lib/coder.js
+++ b/lib/coder.js
@@ -95,7 +95,7 @@ var ICEcoder = {
 
 		// If it's not a JS, CoffeeScript Ruby, CSS or LESS file, replace & and our temp </textarea> value
 		fileName = ICEcoder.openFiles[ICEcoder.selectedTab-1];
-		if (fileName.indexOf(".js")<0 && fileName.indexOf(".coffee")<0 && fileName.indexOf(".rb")<0 && fileName.indexOf(".css")<0 && fileName.indexOf(".less")<0) {
+		if (["js","coffee","rb","css","less"].indexOf(fileName.split(".")[1])<0) {
 			cM = ICEcoder.getcMInstance();
 			content = cM.getValue();
 			content = content.replace(/<ICEcoder:\/:textarea>/g,'</textarea>');
@@ -141,10 +141,8 @@ var ICEcoder = {
 				canDoTheEndTag=true;
 
 				// Check it's not on our list of exceptions
-				for (var j=0;j<ICEcoder.tagNestExceptions.length;j++) {
-					if (tagString==ICEcoder.tagNestExceptions[j]) {
+				if (ICEcoder.tagNestExceptions.indexOf(tagString)>-1) {
 					canDoTheEndTag=false;
-					}
 				}
 
 				if (canDoTheEndTag) {
@@ -181,7 +179,7 @@ var ICEcoder = {
 			ICEcoder.nestDisplay.innerHTML = "";
 			if ("undefined" != typeof ICEcoder.openFiles[ICEcoder.selectedTab-1]) {
 				fileName = ICEcoder.openFiles[ICEcoder.selectedTab-1];
-				if (fileName.indexOf(".js")<0 && fileName.indexOf(".coffee")<0 && fileName.indexOf(".rb")<0 && fileName.indexOf(".css")<0 && fileName.indexOf(".less")<0 &&
+				if (["js","coffee","rb","css","less"].indexOf(fileName.split(".")[1])<0 &&
 					(nestCheck.indexOf("include(")==-1)&&(nestCheck.indexOf("include_once(")==-1)&&
 					(nestCheck.indexOf("<html")>-1||nestCheck.indexOf("<body")>-1)) {
 
@@ -371,7 +369,7 @@ var ICEcoder = {
 			// Switch mode to HTML, PHP, CSS etc
 			ICEcoder.switchMode();
 
-			// Set all cM instances to be hidden, then make our selected instance visable
+			// Set all cM instances to be hidden, then make our selected instance visible
 			for (var i=0;i<ICEcoder.cMInstances.length;i++) {
 				ICEcoder.content.contentWindow['cM'+ICEcoder.cMInstances[i]].getWrapperElement().style.display = "none";
 			}
@@ -402,15 +400,16 @@ var ICEcoder = {
 		cM = ICEcoder.getcMInstance();
 		for(var i=1;i<=ICEcoder.changedContent.length;i++) {
 			if (document.getElementById('closeTabButton'+i)) {
-				ICEcoder.changedContent[i-1]==1 && cM.historySize().undo>0 ? document.getElementById('closeTabButton'+i).style.backgroundColor = "#b00" : document.getElementById('closeTabButton'+i).style.backgroundColor = "rgba(255,255,255,0.3)";
+				document.getElementById('closeTabButton'+i).style.backgroundColor = ICEcoder.changedContent[i-1]==1 && cM.historySize().undo>0
+				? "#b00" : "rgba(255,255,255,0.3)";
 			}
-			i==selectedTab ? tColor = "#000" : tColor = "#fff";
+			tColor = i==selectedTab ? "#000" : "#fff";
 			if ("undefined" != typeof top.ICEcoder.openFiles[i-1] && top.ICEcoder.openFiles[i-1] != "/[NEW]") {
 				fileLink = top.ICEcoder.filesFrame.contentWindow.document.getElementById(top.ICEcoder.openFiles[i-1].replace(/\//g,"|"));
-				if (fileLink) {i==selectedTab ? fileLink.style.backgroundColor = "#49d" : fileLink.style.backgroundColor = "rgba(255,255,255,0.15)";};
+				if (fileLink) {fileLink.style.backgroundColor = i==selectedTab ? "#49d" : "rgba(255,255,255,0.15)";};
 			}
 			document.getElementById('tab'+i).style.color = tColor;
-			i==selectedTab ? bgVPos = -22 : bgVPos = 0;
+			bgVPos = i==selectedTab ? -22 : 0;
 			document.getElementById('tab'+i).style.backgroundPosition = "0 "+bgVPos+"px";
 		}
 		top.ICEcoder.fMIconVis('fMSave',ICEcoder.changedContent[selectedTab-1]==1 ? 1 : 0.3);
@@ -498,7 +497,7 @@ var ICEcoder = {
 		ICEcoder.getNestLocation();
 		nestOK = false;
 		// Nesting is OK if at the end of the file we have no nests left, or it's a JS, Ruby or CSS file
-		if (ICEcoder.htmlTagArray.length==0||fileName.indexOf(".js")>0||fileName.indexOf(".coffee")>0||fileName.indexOf(".rb")>0||fileName.indexOf(".css")>0||fileName.indexOf(".less")>0) {
+		if (ICEcoder.htmlTagArray.length==0||["js","coffee","rb","css","less"].indexOf(fileName.split(".")[1])>0) {
 			nestOK = true;
 		}
 		ICEcoder.nestValid.style.backgroundColor = nestOK ? "#0b0" : "#f00";