function open_win(url_add)
   {	   
   		var top=(screen.availHeight/2);
		var left=(screen.availWidth/2)+110;
		
	   myWindow=window.open(url_add,"_blank","top="+top+",left="+left+",channelmode=no,toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=1, resizable=no, copyhistory=no, width=400, height=400,titlebar=no");
   }
function close_win(myWindow)
{		
	myWindow.close();
}