Checkout Url problem if module setting not selected

[leedavi]

If the module setting (Redirect To) of the full cart modules are not saved then the store setting should be used.

However the store setting option creates a url of :

http://...../Default.aspx?tabid=140?cartstep=2

instead of

http://...../Default.aspx?tabid=140&cartstep=2

this url is OK when the module setting is selected.