Small transperency problem

I have created some plants for my game, for the leaves I used png's. The problem is that when I apply a transparency layer to my model the leaves don't seam to draw in the correct order. I noticed there is the SORT:: prefix in max exporter. Is there anything like this in the maya exporter? tor another way to over come this problem? And also how do we use a sprat image ".alpha.jpg" to create out transparency?

Thanks