Does anyone know how to get rid of the white square behind the sprites.
Make sure your files are saved in .PNG or .GIF format.
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Make sure you have updated your graphics card drivers!
It also has to be made transparent using a program like Paint.NET (or Photoshop or Gimp, if you're that fancy <img src="smileys/smiley17.gif" border="0" align="middle" />), in addition to being saved as a .PNG or a .GIF.