function open_function(url,width,height,options) { 
	self.msgWindow = open(url, "Window", "width=" + width + ",height=" + height + ",screenX=" + (screen.width-width)/2 + ",screenY=" + (screen.height-height)/2 + ",dependent=yes" + ",left=" + (screen.width-width)/2 + ",top=" + (screen.height-height)/2 + options );
	if (self.msgWindow) { 
		self.msgWindow.focus();
		if (self.msgWindow.opener == null) self.msgWindow.opener = self;
	}
}

function get_url (url, k0 ,v0 ,k1 ,v1 ,k2 ,v2 ,k3 ,v3 ,k4 ,v4 ) { 
	if (k0 && v0) url += "?" + k0 + "=" + escape(v0); if (k1 && v1) url += "&" + k1 + "=" + escape(v1); 
	if (k2 && v2) url += "&" + k2 + "=" + escape(v2); if (k3 && v3) url += "&" + k3 + "=" + escape(v3);
	if (k4 && v4) url += "&" + k4 + "=" + escape(v4); 
	return url;
}