function xWindowOpen(url, width, height){
  window.open( url,
			        "_blank",
			        " toolbar=no"
			       +",location=no"
			       +",directories=no"
			       +",status=no"
			       +",menubar=no"
			       +",scrollbars=no"
			       +",resizable=yes"
			       +",titlebar=yes"
			       +",channelmode=no"
			       +",width="+width
			       +",height="+height
			       +",left=" + ((screen.width - width) / 2)
			       +",top=" + ((screen.height - height) / 2)
			      );
}