function startCustomer(mandant, topic, origin) 
{
	var url = "http://www.vDialog.net/CustomerApp.html";
	if (mandant != undefined && mandant != null)
	{
		url += "?mandant=" + mandant;
		if (topic != undefined && topic != null)
			url += "&topic=" + topic;
		if (origin != undefined && origin != null)
			url += "&origin=" + origin;
		var customerWindow = window.open(url, "vDialog", "width=300,height=500,left=100,top=100,resizable=no,location=no,menubar=no");
		customerWindow.focus();
		return customerWindow;
	}
	return null;
}