function popUp(url, name, height, width)
							{
								var winl = (screen.width - width) / 2;
								var wint = (screen.height - height) / 2;
								winprops = 'height='+height+',width='+width+',top='+wint+',left='+winl+',resizable=no,toolbar=no'
								
								newwindow=window.open(url,name,winprops);
								if (window.focus) { newwindow.focus() }
								return false;
							}