Made hide, show, toggle, slideUp, slideDown, and slideToggle animate margins...

Made hide, show, toggle, slideUp, slideDown, and slideToggle animate margins and paddings in addition to height, width, and opacity (results in a much-smoother animation).

src/fx.js

-var elemdisplay = {};
+var elemdisplay = {},
+	fxHeight = [ "height", "marginTop", "marginBottom", "paddingTop", "paddingBottom" ],
+	fxWidth = [ "width", "marginLeft", "marginRight", "paddingLeft", "paddingRight" ],
+	fxOpacity = [ "opacity" ];
+
+function genFx( type, width, height, extra ){
+	var obj = {};
+	jQuery.each(width.concat( height || [], extra || []), function(){
+		obj[ this ] = type;
+	});
+	return obj;
+}
 
 jQuery.fn.extend({
 	show: function(speed,callback){
 		if ( speed ) {
-			return this.animate({
-				height: "show", width: "show", opacity: "show"
-			}, speed, callback);
+			return this.animate( genFx("show", fxHeight, fxWidth, fxOpacity), speed, callback);
 		} else {
 			for ( var i = 0, l = this.length; i < l; i++ ){
 				var old = jQuery.data(this[i], "olddisplay");
@@ -39,9 +48,7 @@ jQuery.fn.extend({
 
 	hide: function(speed,callback){
 		if ( speed ) {
-			return this.animate({
-				height: "hide", width: "hide", opacity: "hide"
-			}, speed, callback);
+			return this.animate( genFx("hide", fxHeight, fxWidth, fxOpacity), speed, callback);
 		} else {
 			for ( var i = 0, l = this.length; i < l; i++ ){
 				var old = jQuery.data(this[i], "olddisplay");
@@ -66,9 +73,7 @@ jQuery.fn.extend({
 					var state = bool ? fn : jQuery(this).is(":hidden");
 					jQuery(this)[ state ? "show" : "hide" ]();
 				}) :
-				this.animate({
-					height: "toggle", width: "toggle", opacity: "toggle"
-				}, fn, fn2);
+				this.animate(genFx("toggle", fxHeight, fxWidth, fxOpacity), fn, fn2);
 	},
 
 	fadeTo: function(speed,to,callback){
@@ -165,9 +170,9 @@ jQuery.fn.extend({
 
 // Generate shortcuts for custom animations
 jQuery.each({
-	slideDown: { height:"show" },
-	slideUp: { height: "hide" },
-	slideToggle: { height: "toggle" },
+	slideDown: genFx("show", fxHeight),
+	slideUp: genFx("hide", fxHeight),
+	slideToggle: genFx("toggle", fxHeight),
 	fadeIn: { opacity: "show" },
 	fadeOut: { opacity: "hide" }
 }, function( name, props ){