diff --git a/jquery.rwdImageMaps.js b/jquery.rwdImageMaps.js
index 93b3d0e..fd6713d 100644
--- a/jquery.rwdImageMaps.js
+++ b/jquery.rwdImageMaps.js
@@ -1,9 +1,9 @@
 /*
-* rwdImageMaps jQuery plugin v1.6
+* rwdImageMaps jQuery plugin v1.6
 *
 * Allows image maps to be used in a responsive design by recalculating the area coordinates to match the actual image size on load and window.resize
 *
-* Copyright (c) 2016 Matt Stow
+* Copyright (c) 2016 Matt Stow
 * https://github.com/stowball/jQuery-rwdImageMaps
 * http://mattstow.com
 * Licensed under the MIT license
@@ -11,44 +11,52 @@
 ;(function($) {
 	$.fn.rwdImageMaps = function() {
 		var $img = this;
-
+
 		var rwdImageMap = function() {
 			$img.each(function() {
 				if (typeof($(this).attr('usemap')) == 'undefined')
 					return;
-
+
 				var that = this,
 					$that = $(that);
-
+
 				// Since WebKit doesn't know the height until after the image has loaded, perform everything in an onload copy
-				$('<img />').on('load', function() {
-					var attrW = 'width',
-						attrH = 'height',
-						w = $that.attr(attrW),
-						h = $that.attr(attrH);
-
-					if (!w || !h) {
-						var temp = new Image();
-						temp.src = $that.attr('src');
-						if (!w)
-							w = temp.width;
-						if (!h)
-							h = temp.height;
+				$('<img />').on('load', function() {
+					var w, h;
+					if ($that.data('w') && $that.data('h')) {
+						w = $that.data('w');
+						h = $that.data('h');
+					} else {
+						var attrW = 'width',
+							attrH = 'height';
+							w = $that.attr(attrW);
+							h = $that.attr(attrH);
+
+						if (!w || !h) {
+							var temp = new Image();
+							temp.src = $that.attr('src');
+							if (!w)
+								w = temp.width;
+							if (!h)
+								h = temp.height;
+						}
+						$that.data('w', w);
+						$that.data('h', h);
 					}
-
+
 					var wPercent = $that.width()/100,
 						hPercent = $that.height()/100,
 						map = $that.attr('usemap').replace('#', ''),
 						c = 'coords';
-
+
 					$('map[name="' + map + '"]').find('area').each(function() {
 						var $this = $(this);
 						if (!$this.data(c))
 							$this.data(c, $this.attr(c));
-
+
 						var coords = $this.data(c).split(','),
 							coordsPercent = new Array(coords.length);
-
+
 						for (var i = 0; i < coordsPercent.length; ++i) {
 							if (i % 2 === 0)
 								coordsPercent[i] = parseInt(((coords[i]/w)*100)*wPercent);
@@ -61,7 +69,7 @@
 			});
 		};
 		$(window).resize(rwdImageMap).trigger('resize');
-
+
 		return this;
 	};
-})(jQuery);
+})(jQuery);
diff --git a/jquery.rwdImageMaps.min.js b/jquery.rwdImageMaps.min.js
index 61854cd..5b9e79f 100644
--- a/jquery.rwdImageMaps.min.js
+++ b/jquery.rwdImageMaps.min.js
@@ -1,11 +1,11 @@
 /*
-* rwdImageMaps jQuery plugin v1.6
+* rwdImageMaps jQuery plugin v1.6
 *
 * Allows image maps to be used in a responsive design by recalculating the area coordinates to match the actual image size on load and window.resize
 *
-* Copyright (c) 2016 Matt Stow
+* Copyright (c) 2016 Matt Stow
 * https://github.com/stowball/jQuery-rwdImageMaps
 * http://mattstow.com
 * Licensed under the MIT license
 */
-;(function(a){a.fn.rwdImageMaps=function(){var c=this;var b=function(){c.each(function(){if(typeof(a(this).attr("usemap"))=="undefined"){return}var e=this,d=a(e);a("<img />").on('load',function(){var g="width",m="height",n=d.attr(g),j=d.attr(m);if(!n||!j){var o=new Image();o.src=d.attr("src");if(!n){n=o.width}if(!j){j=o.height}}var f=d.width()/100,k=d.height()/100,i=d.attr("usemap").replace("#",""),l="coords";a('map[name="'+i+'"]').find("area").each(function(){var r=a(this);if(!r.data(l)){r.data(l,r.attr(l))}var q=r.data(l).split(","),p=new Array(q.length);for(var h=0;h<p.length;++h){if(h%2===0){p[h]=parseInt(((q[h]/n)*100)*f)}else{p[h]=parseInt(((q[h]/j)*100)*k)}}r.attr(l,p.toString())})}).attr("src",d.attr("src"))})};a(window).resize(b).trigger("resize");return this}})(jQuery);
+;!function(t){t.fn.rwdImageMaps=function(){var a=this;return t(window).resize(function(){a.each(function(){if(void 0!==t(this).attr("usemap")){var a=t(this);t("<img />").on("load",function(){var r,i;if(a.data("w")&&a.data("h"))r=a.data("w"),i=a.data("h");else{if(r=a.attr("width"),i=a.attr("height"),!r||!i){var e=new Image;e.src=a.attr("src"),r||(r=e.width),i||(i=e.height)}a.data("w",r),a.data("h",i)}var n=a.width()/100,h=a.height()/100,s=a.attr("usemap").replace("#",""),d="coords";t('map[name="'+s+'"]').find("area").each(function(){var a=t(this);a.data(d)||a.data(d,a.attr(d));for(var e=a.data(d).split(","),s=new Array(e.length),c=0;c<s.length;++c)s[c]=c%2==0?parseInt(e[c]/r*100*n):parseInt(e[c]/i*100*h);a.attr(d,s.toString())})}).attr("src",a.attr("src"))}})}).trigger("resize"),this}}(jQuery);
\ No newline at end of file