Small optimization to jQuery.css to save 12 bytes

src/jquery/jquery.js

@@ -1373,7 +1373,7 @@ jQuery.extend({
 			});
 
 			jQuery.swap( e, old, function() {
-				if (jQuery.css(e,"display") != "none") {
+				if ( jQuery(e).is(':visible') ) {
 					oHeight = e.offsetHeight;
 					oWidth = e.offsetWidth;
 				} else {
@@ -1383,14 +1383,14 @@ jQuery.extend({
 							visibility: "hidden", position: "absolute", display: "block", right: "0", left: "0"
 						}).appendTo(e.parentNode)[0];
 
-					var parPos = jQuery.css(e.parentNode,"position");
-					if ( parPos == "" || parPos == "static" )
+					var parPos = jQuery.css(e.parentNode,"position") || "static";
+					if ( parPos == "static" )
 						e.parentNode.style.position = "relative";
 
 					oHeight = e.clientHeight;
 					oWidth = e.clientWidth;
 
-					if ( parPos == "" || parPos == "static" )
+					if ( parPos == "static" )
 						e.parentNode.style.position = "static";
 
 					e.parentNode.removeChild(e);