diff --git a/perfmap.js b/perfmap.js
index 59c0482..be82861 100644
--- a/perfmap.js
+++ b/perfmap.js
@@ -2,44 +2,66 @@ var gZeroLeft = 0;
 var gZeroTop = 0;
 var gWinWidth = window.innerWidth || document.documentElement.clientWidth;
 
-function markElements(type) {
-    var aElems = document.getElementsByTagName(type);
+function findImages() {
+    var aElems = document.getElementsByTagName('*');
+    var re = /url\((http.*)\)/ig;
     for ( var i=0, len = aElems.length; i < len; i++ ) {
         var elem = aElems[i];
-        if ( "link" == type && "stylesheet" != elem.rel ) {
-            continue;
-        }
+        var style = window.getComputedStyle(elem);
         var url = elem.src || elem.href;
-        if ( url ) {
-            var entry = performance.getEntriesByName(url)[0];
-            if ( entry ) {
-                var xy = getCumulativeOffset(elem);
-                var wh = elem.getBoundingClientRect();
-                var width = wh.width;
-                var height = wh.height;
-                if(width > 20){
-	                if(height > 20){
-		                placeMarker(xy, width, height, type, entry);
+        var hasImage = 0;
+        re.lastIndex = 0; // reset state of regex so we catch repeating spritesheet elements
+        if (elem.tagName == 'IMG') {
+        	hasImage = 1;
+		}
+		if (style['background-image']) {
+        	var backgroundImage = style['background-image'];
+			var matches = re.exec(style['background-image']);
+			if (matches && matches.length > 1){
+				url = backgroundImage.substring(4);
+				url = url.substring(0, url.length - 1);
+				hasImage = 1;
+			}
+		}
+		if(hasImage == 1){
+	        if ( url ) {
+	            var entry = performance.getEntriesByName(url)[0];
+	            if ( entry ) {
+	                var xy = getCumulativeOffset(elem);
+	                var wh = elem.getBoundingClientRect();
+	                var width = wh.width;
+	                var height = wh.height;
+	                if(width > 10){
+		                if(height > 10){
+			                placeMarker(xy, width, height, entry);
+		                }
 	                }
-                }
-            }
-        }
+	            }
+	        }
+	    }
     }
 }
 
-function placeMarker(xy, width, height, type, entry) {
-	
+function placeMarker(xy, width, height, entry) {
 	var heat = entry.responseEnd / loaded;
 	if(width < 170){
 		var padding = 12;
 		var size = 12;
+	}else if(width > 400){
+		var padding = 13;
+		var size = 26;
 	}else{
 		var padding = 9;
 		var size = 18;
 	}
     var marker = document.createElement("div");
-    marker.style.cssText = "position: absolute; box-sizing: border-box; color: #000; padding-left:10px; padding-right:10px; line-height:14px; font-size: " + size + "px; font-weight:800; text-align:center; opacity: 0.85; " + heatmap(heat) + " top: " + xy.top + "px; left: " + xy.left + "px; width: " + width + "px; height:" + height + "px; padding-top:" + ((height/2)-padding) + "px; z-index: 4000;";
-    marker.innerHTML = parseInt(entry.responseEnd) + "ms (" + parseInt(entry.duration) + "ms)";
+    marker.className = "perfmap";
+    marker.style.cssText = "position: absolute; box-sizing: border-box; color: #fff; padding-left:5px; padding-right:5px; line-height:14px; font-size: " + size + "px; font-weight:800; font-family:\"Helvetica Neue\",sans-serif; text-align:center; opacity: 0.95; " + heatmap(heat) + " top: " + xy.top + "px; left: " + xy.left + "px; width: " + width + "px; height:" + height + "px; padding-top:" + ((height/2)-padding) + "px; z-index: 4000;";
+    if(width > 50){
+    	if(height > 15 ){
+    		marker.innerHTML = parseInt(entry.responseEnd) + "ms (" + parseInt(entry.duration) + "ms)";
+    	}
+    }
     document.body.appendChild(marker);
     if ( 0 == xy.top ) {
         gZeroLeft += marker.offsetWidth + 10;
@@ -50,34 +72,27 @@ function placeMarker(xy, width, height, type, entry) {
     }
 }
 
-
 function prettyType(type) {
     return ( "link" == type ? "stylesheet" : type );
 }
 
 function heatmap(heat) {
-    if ( heat < 0.125 ) {
-        return "background: #d73c4c;"
+    if ( heat < 0.16 ) {
+        return "background: #1a9850;"
     }
-    else if ( heat < 0.25 ) {
-        return "background: #f66d3a;"
+    else if ( heat < 0.32 ) {
+        return "background: #66bd63;"
     }
-    else if ( heat < 0.375 ) {
-        return "background: #ffaf59;"
+    else if ( heat < 0.48 ) {
+        return "background: #a6d96a;"
     }
-    else if ( heat < 0.5 ) {
-        return "background: #ffe185;"
+    else if ( heat < 0.64 ) {
+        return "background: #fdae61;"
     }
-    else if ( heat < 0.625 ) {
-        return "background: #e6f693;"
-    }
-    else if ( heat < 0.75 ) {
-        return "background: #aadea2;"
-    }
-   else if ( heat < 0.875 ) {
-        return "background: #62c3a5;"
+    else if ( heat < 0.8 ) {
+        return "background: #f46d43;"
     }else{
-	    return "background: #2c87bf;"
+	    return "background: #d73027;"
     }
 }
 
@@ -101,7 +116,6 @@ function getCumulativeOffset(obj) {
             left += obj.offsetLeft;
             top  += obj.offsetTop;
             width += obj.offsetWidth;
-            //console.log(obj);
         } while (obj = obj.offsetParent);
     }
 
@@ -120,6 +134,11 @@ function getCumulativeOffset(obj) {
 // get full page load time to calculate heatmap max
 var loaded = performance.timing.loadEventEnd - performance.timing.navigationStart;
 
-markElements("img");
-//markElements("script");
-//markElements("link");
\ No newline at end of file
+// remove any exisiting "perfmap" divs on second click
+var elements = document.getElementsByClassName("perfmap");
+while(elements.length > 0){
+    elements[0].parentNode.removeChild(elements[0]);
+}
+
+// build heatmap
+findImages();
\ No newline at end of file