function fullscreen(url) {
  w = screen.availWidth-10;
  h = screen.availHeight-20;
       
	   message  = "A pop-up blocker was detected!"
       message += " This site requires the use of pop-up windows, "
	   message += "please set your pop-up blocker to allow pop-ups for this site."

  features = "width="+w+",height="+h;
  features += ",left=0,top=0,screenX=0,screenY=0,resizable=yes,location=yes,toolbar=yes,scrollbars=yes";

  var w = window.open(url, "", features);
	if(!w) { // popup was blocked
	  alert(message)
	}	  

}