var popheight=400; 
  var popwidth=700; 
 
  function pop(pageToLoad, winName, center) { 
	  xposition=0; yposition=0;
	  
	  if ((parseInt(navigator.appVersion) >= 4 ) && (center))
	  { 
		  xposition = (screen.width - popwidth) / 2;
		  yposition = (screen.height - popheight) / 2; 
	  } 
	  
	  args = "width=" + popwidth + ","
		+ "scrollbars=1," 
		+ "location=0," 
		+ "menubar=0," 
		+ "resizable=0," 
		+ "status=0," 
		+ "titlebar=0," 
		+ "toolbar=0," 
		+ "height=" + popheight + "," 
		+ "screenx=" + xposition + ","  //NN 
		+ "screeny=" + yposition + ","  //NN 
		+ "left=" + xposition + ","    //IE 
		+ "top=" + yposition;          //IE
		
	  var myWin = window.open(pageToLoad,winName,args); 
	  myWin.focus(); 
 }