Inserting a Picture as a background in a graph macro

[robjowens]

Sub OptionButton190_Click()
'Selects Graph
Sheets("Map").ChartObjects("Chart 3").Activate
With ActiveChart.PlotArea
'Selects picture when button pressed
.Fill.UserPicture PictureFile:= _
"E:\PORTFOLIO MANAGEMENT\xxxx\yyyy\zzzz\Mapping\040511\GH1.png"
.Fill.Visible = True
End With
End Sub

How do I go about change the picture location to a picture on a sheet within the workbook?

I want to be able to take email this workbook to other people who don't have access to my network and who are even bigger excel idiots than me!