diff --git a/jquery.rwdImageMaps.js b/jquery.rwdImageMaps.js
index c9d7348..6aed5e1 100644
--- a/jquery.rwdImageMaps.js
+++ b/jquery.rwdImageMaps.js
@@ -27,6 +27,11 @@
 						w = $that.attr(attrW),
 						h = $that.attr(attrH);
 					
+					if (!w || !h){
+						w = that.naturalWidth;
+						h = that.naturalHeight;
+					}
+					
 					if (!w || !h) {
 						var temp = new Image();
 						temp.src = $that.attr('src');
@@ -64,4 +69,4 @@
 		
 		return this;
 	};
-})(jQuery);
\ No newline at end of file
+})(jQuery);