function openwindow(url, width, height) { 
  var win; 
  var windowName; 
  var params; 
  windowName  = "features"; 
  params = "toolbar=0,"; 
  params += "location=0,"; 
  params += "directories=0,"; 
  params += "status=0,"; 
  params += "menubar=0,"; 
  params += "scrollbars=1,"; 
  params += "resizable=1,"; 
  params += "top=200,"; 
  params += "left=300,"; 
  params += "width="+width+","; 
  params += "height="+height; 
  win = window.open(url, windowName, params);
}