See this documentation:
http://wowprogramming.com/docs/widge...re/SetTexCoord
* top - Top (or minY) edge of the scaled/cropped image, as a fraction of the image's height from the top (number)
* bottom - Bottom (or maxY) edge of the scaled/cropped image, as a fraction of the image's height from the top (number)
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The reason it's black is because you've cropped it to show everything between 0.75 and 0.75 (which is nothing).
Try: 0, 0, 0.25, 0.75 (which will show everything between 0.25 and 0.75, which is half the image)