This should be a sub procedure used in your Project,
ShowNavButton "Complete", "vbscript:SubmitFormQizard(3)", True
or You can call this Way
Call ShowNavButton ( "Complete", "vbscript:SubmitFormQizard(3)", True)
Where would I find the vbscript that triggers this?
You can find This in your project folder ,
1.Press Ctrl+F5
2.Choose Folder Search >>Selecting your Project Folder
3.Enter Keyword on FInd >>Sub ShowNavButton
4.Hit Find All Button
This should throw ur page which contains this Sub procedure .