Rewrote the hide and show methods to fix the issue with Safari not hiding...

Rewrote the hide and show methods to fix the issue with Safari not hiding distached elements. Fixed #1239, #2233, #3038, #3343, #3395. They're also faster now, as well.

src/fx.js

+var elemdisplay = {};
+
 jQuery.fn.extend({
 	show: function(speed,callback){
-		return speed ?
-			this.animate({
+		if ( speed ) {
+			return this.animate({
 				height: "show", width: "show", opacity: "show"
-			}, speed, callback) :
-
-			this.filter(":hidden").each(function(){
-				this.style.display = this.oldblock || "";
-				if ( jQuery.css(this,"display") == "none" ) {
-					var elem = jQuery("<" + this.tagName + " />").appendTo("body");
-					this.style.display = elem.css("display");
-					// handle an edge condition where css is - div { display:none; } or similar
-					if (this.style.display == "none")
-						this.style.display = "block";
-					elem.remove();
+			}, speed, callback);
+		} else {
+			for ( var i = 0, l = this.length; i < l; i++ ){
+				var old = jQuery.data(this[i], "olddisplay");
+				
+				this[i].style.display = old || "";
+				
+				if ( jQuery.css(this[i], "display") === "none" ) {
+					var tagName = this[i].tagName, display;
+					
+					if ( elemdisplay[ tagName ] ) {
+						display = elemdisplay[ tagName ];
+					} else {
+						var elem = jQuery("<" + this[i].tagName + " />").appendTo("body");
+						
+						display = elem.css("display");
+						if ( display === "none" )
+							display = "block";
+						
+						elem.remove();
+						
+						elemdisplay[ this[i].tagName ] = display;
+					}
+					
+					this[i].style.display = jQuery.data(this[i], "olddisplay", display);
 				}
-			}).end();
+			}
+			
+			return this;
+		}
 	},
 
 	hide: function(speed,callback){
-		return speed ?
-			this.animate({
+		if ( speed ) {
+			return this.animate({
 				height: "hide", width: "hide", opacity: "hide"
-			}, speed, callback) :
-
-			this.filter(":visible").each(function(){
-				this.oldblock = this.oldblock || jQuery.css(this,"display");
-				this.style.display = "none";
-			}).end();
+			}, speed, callback);
+		} else {
+			for ( var i = 0, l = this.length; i < l; i++ ){
+				var old = jQuery.data(this[i], "olddisplay");
+				if ( !old && old !== "none" )
+					jQuery.data(this[i], "olddisplay", jQuery.css(this[i], "display"));
+				this[i].style.display = "none";
+			}
+			return this;
+		}
 	},
 
 	// Save the old toggle function