When you include a file, it is copied to the object data directory. This is found in the Current Theme folder. But once it's saved there, you can refer to it in script as shown above (after applying, you should also find it in the dropdown for images in States > Appearance.) Yes, you'll need to put the name of your images, instead.
Blech, I forgot the vbscript code thingy on this forum includes numbers (someone should fix that.) Here it is again. Go to Properties > General > Script > New, and copy and paste the code in DX Script Editor window:
'Called on mouse over object
Sub Object_OnMouseEnter
If object.state = "Full" Then
object.Picture = "binfullover.jpg"
ElseIf object.state = "Empty" Then
object.Picture = "binemptyover.jpg"
End If
End Sub
'Called when mouse leaves object
Sub Object_OnMouseLeave
If object.state = "Full" Then
object.Picture = "binfullaway.jpg"
ElseIf object.state = "Empty" Then
object.Picture = "binemptyaway.jpg"
End If
End Sub
The DX Script Helper only stores codes for easy copy and pasting. By clicking on the code title, it copies the code to the system clipboard, so you can paste it wherever. (See the skin's instructions/description.)