Splitting help link for a common dialog

[Cristian Marchi]

I'm working on a fix for bug #605991 [1] but I need help from a 
programmer: I noticed that the New Job dialog [2] is common for Vendor 
and Customer Jobs and the help button is linked to the same reference. 
Would it be possible to make the help button link to an help page for 
"New Vendor Job" and a different page for "New Customer Job"? The same 
should apply to the "Process payment" dialog and probably in other cases 
but first I want to know if it is possible. If not I will try rearrange 
the referenced help pages.

Thanks
Cristian

[1] https://bugzilla.gnome.org/show_bug.cgi?id=605991
[2] 
http://svn.gnucash.org/trac/browser/gnucash/trunk/src/business/business-gnome/dialog-job.c