To put in greater detail of what Houdini said:
changeimgvis #imgnumber,
#1-3;
ex:
NPC Code:
showimg 200,blahblahgui.png,screenwidth-imgwidth(blahblahgui.png),screenheight-imgheight(blahblahgui.png);
changeimgvis 200,3;
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0 = under everything, except other images that have this set(will act like 1 to them)
-
1 = just like an npc, the ones behind the image will show up under, and in front, will be over...
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2 = over, and for other images set like this, well, you can figure it out
-
3 + = Stick on screen, uses pixels for x,y, not tiles
For use of 3, or higher, make sure the image number is above...
100 (I believe), so others dont see your images aswell... that can get messy.