Millisecond Forums

I am displaying consent form with written text in the form of image and below that are the response questions. <picture consent>
/ items = ("consent.png")
/ valign = top
/ position = (50,0)
/ size = (100%, 100%)
</picture>
But I found that it was appearing aligned with top of the screen on my laptop but not on the desktop.  So I changed the script to the one that is given above. Now Its appearing correctly. Is this the correct solution ? Will it also appear aligned from the top on a Mac computer also.I am worried because if it is not aligned properly, it hides some of the questions.
Thanks Abhi