Add background image to the frame

[shurshik]

Hi!

I need to add an own image to the frame as a background. I have only 1 problem, the image is bigger than frame, example:
frame 300x300
image 600x400

I need to put a part of this image BUT I don't want that other part is visible outside the frame... I already set layer to background, it doesn't help.

crMapBackground = myframe:CreateTexture(nil,"BACKGROUND")
crMapBackground:SetTexture("Interface\\AddOns\\*\\test_image")
crMapBackground:SetPoint("CENTER",0,0)

how can I make it invisible outside of the frame? Thanks!