function openwindow(url,wn,w,h){var it=(window.screen.availHeight-30-h)/2;var il=(window.screen.availWidth-10-w)/2;var wo=window.open(url,wn,'height='+h+',width='+w+',top='+it+',left='+il+',toolbar=no,menubar=no,scrollbars=yes,resizeable=no,location=no,status=no');wo.focus();}