fix prototype's element#show method to work with elements hidden via css

Object.extend(Element.Methods, {
show: function(el) {
    //fixing prototypes show method so that it works for elements hidden via css too (like jquery)
	var display = el.getStyle("display");
	if(display === "none") {
	  var elem = new Element(el.tagName);
	  $$("body").invoke("insert", elem);
	  display = elem.getStyle("display");
	  if (display === "none")
	    display = "block";
	    elem.remove();
	  }
    el.setStyle({"display": display});
    return el;
  }
});

Element.addMethods();