function tarih_onizle()

	{

			var t=(screen.height/2)-(400/2);

        	var l=(screen.width/2)-(820/2);

			window.open("http://www.sitearaclari.com/dosyalar/tarihtebugun/demo.html","pencere",'width=850,height=500,top='+t+',left='+l);

	}