Navigation in a SharePoint CUstom List App

[User 13075677]

I have a SharePoint Custom List Application that in some cases could go

Examples:
Dashboard.aspx has a link that calls Editform_Gates.aspx with the following passing parameter values for record ID and SOURCE
EditForm_Gates.aspx?ID=14169&RAPT=NG2710&SOURCE=Dashboard.aspx

The EditForm_Gates.aspx then has a couple links that call other pages to add/update children associated records
NewGate_5000.aspx?mID=14169&SOURCE=EditForm_Gates.aspx?ID=14169 or
EditGate.aspx?ID=73671&SOURCE=EditForm_Gates.aspx?ID=14169

The problem I have is once you get to that third deep code if you hit cancel or save it does go back to the second page the EditForm_Gates.aspx but from there if you hit cancel or back it loses the SOURCE= from the first call and does not know where to go..

What is the proper way to do this and if any samples or examples are out there I would greatly appreciate it.

Thanks in Advance