Well, Like JesusFreak said save the pic as a GIF file with 0 matte and a transparent background. Then paste it into your existing picture, you may get a little pixalation but not too bad. For instance look at the blurriness around the GBs in Jesusfreaks banner. I suppose I'm a little late and I think my instructions lean more towards photoshop anyway Hope it helped in the slightest bit imaginable though