How do click an inventort Item and make it the Button's Image?

[Dr Snark]

Here is some Code i used:

 //ff=GetInvAt (mouse.x, mouse.y);
 GUIOn(3);
SetButtonPic (3, 0, 1, 100);
SetButtonPic (3, 0, 1, -1);

i know it can be done because i saw it.

and it keeps Object Not Valid?

[cornjob]

Actually, you can do this automatically...
Just make the button's text: (INV) or (INVNS). Then the active inv item will be drawn on top of the button graphic.