function openWindow (url, windowname, width, height, status, scrollbars) {
   var windowFeatures = "";
   var win;

   var screenX = Math.floor(screen.availWidth/2 - width/2);
   var screenY = Math.floor(screen.availHeight/2 - height/2);

   windowFeatures  = "toolbar=0,resizable=yes,dependent=yes,personalbar=0";
   windowFeatures += ",scrollbars="+scrollbars+",menubar=0";
   windowFeatures += ",height="+height+",width="+width+",status="+status;
   windowFeatures += ",screenX="+screenX+",screenY="+screenY;
   windowFeatures += ",left="+screenX+",top="+screenY;

   win = window.open(url, windowname, windowFeatures);
}