Showpoly problem!

[ToNy_W]

Alright, i don't know if i'm doing something wrong there or if it just shouldn't be done, but here's my problem:

i draw a polygon with showpoly:

showpoly(200,{player.x, player.y, player.x + 5, player.y, player.x + 5, player.y + 5, player.x, player.y + 5});

and then i try setting an image:

findimg(200).image = "image.gif";

when i use door.png or block.png it works, the image takes the size of the polygon and all, but if i try with images that i uplaoded by myself (png or gif, i've tried both), it gets all weird x-x!