Hey what version of Unity are you using? Did you know about the new UI system on the upcoming release of unity you can test it on the latest beta 4.6
Here is a tutorial https://www.youtube.com/watch?v=EOX6itCuKOc
It's really helpful
You can download the beta 20 here https://unity3d.com/es/unity/beta/4.6
if you want to do it be your self. Look for the window height and width in pixels and get the pixel size of your GUI element then do the maths , calculate the offset from the (0,0) top left corner and so.
But i really recommend you to try the new beta ;)
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