var popup = null;
var popupState = false
function CreateWnd (file, width, height, resize){
	var doCenter = false;
	if((popup == null) || popup.closed){
		attribs = "";
		if(resize) size = "yes"; else size = "no";

		for(var item in window)
			{ if(item == "screen") { doCenter = true; break; } }

		if(doCenter)		{
			if(screen.width <= width || screen.height <= height) size = "yes";

			WndTop  = (screen.height - height) / 2;
			WndLeft = (screen.width  - width)  / 2;
			attribs = "width=" + width + ",height=" + height + ",resizable=" + size + ",scrollbars=" + size + "," + 
			"status=no,toolbar=no,directories=no,menubar=no,location=no,top=" + WndTop + ",left=" + WndLeft;
		}else{
			if(navigator.appName=="Netscape" && navigator.javaEnabled()){
				var toolkit = java.awt.Toolkit.getDefaultToolkit();
				var screen_size = toolkit.getScreenSize();
				if(screen_size.width <= width || screen_size.height <= height) size = "yes";

				WndTop  = (screen_size.height - height) / 2;
				WndLeft = (screen_size.width  - width)  / 2;
				attribs = "width=" + width + ",height=" + height + ",resizable=" + size + ",scrollbars=" + size + "," + 
				"status=no,toolbar=no,directories=no,menubar=no,location=no,top=" + WndTop + ",left=" + WndLeft;
			}else{
				size = "yes";
				attribs = "width=" + width + ",height=" + height + ",resizable=" + size + ",scrollbars=" + size + "," + 
				"status=no,toolbar=no,directories=no,menubar=no,location=no";
			}
		}
		// create the window
		popup = open(file, "", attribs);
	}else{
		DestroyWnd();
		CreateWnd(file, width, height, resize);
	}
}