In a Phonegap application, i open an external web app using window.location.href in body's onload event. It is working good with other urls like google.com and facebook.com. But i have to open my SAP Bsp application like this.
When i open my SAP BSP app, it will ask login credentials in popup like below.
screenshot taken from windows OS.

phone gap is not reacting anything for this case. If i disable this popup in my SAP System, app loads good. But i need to enable this popup.
Any help?