use vbs create a new tab in one IE window

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VBScript

I use the following code(VBScript) to open 2 urls:

Set IE = CreateObject("InternetExplorer.Application")
IE.Navigate "http://www.google.com"
IE.Visible = True

Set IE2 = CreateObject("InternetExplorer.Application")
IE2.Navigate "http://www.youtube.com"
IE2.Visible = True

When I execute the code, then TWO IE windows appear and they navigate to the url as I wanted.

But I don't want 2 WINDOWS. I want 2 Tabs in ONE WINDOW. How to write the code?
Waiting online! Thank you!