General :: Ribbon Load Custom Image

I have the following xml script in my table and I want to make the 3rd button be a image that is saved in my c drive.

Code:
<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui" onLoad="onRibbonLoad1">
<ribbon startFromScratch="true" >
<tabs>

[code]....

I found the following getimage script but am not sure how to apply it to my button, I have seem various examples on sites but just can't get it to work.
Can I somehow set the icon path like C:Image1.png

Code:
Public Sub getImages(control As IRibbonControl, _
ByRef image)
Set Image = LoadPicture(getAppPath & control.Tag)

' Maybe something like
' Set Image = LoadPicture(c:image1.png)
End Sub