function newPopup(url,name,dim1,dim2) {
				largo = dim1;
				alto = dim2;
				posA = Math.floor((screen.height - alto)/2);
				posL = Math.floor((screen.width - largo)/2);
				popupWindow = window.open(url, name, "width=" + largo + ",height=" + alto + ",top =" + posA + ",left=" + posL);
			}