var browser_name = navigator.appName;
var stat=0;
var win;



function w3(url,W,H){
  if (stat==1&&browser_name == "Microsoft Internet Explorer" ){ win.close();}
   win=window.open( url, "picture1", "width="+W+",height="+H+",left="+(screen.width-W)/2+",top="+(screen.height-H)/2+",toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no"  );
   win.focus();
   stat=1;
  }