[pdftex] bibtex : multiple entries a year for the same first author

[H V]

Dear pdftex wizards,
 
 I use the attached .bst and .sty files.
 When I use 2 references with the same authors, the same year (like
 Jones, Smith and Poirot 2006a
 and
 Jones, Smith and Poirot 2006b
 ), I have correct extra labels "a" and "b".
 
 But if some authors change their rank, with the same first author  (like 
 Jones, Smith and Poirot 2005
 and
 Jones, Poirot and Smith 2005
 ), the reference in the text will be Smith et al (2005) for both papers. I'd rather have Smith et al (2005a) and Smith et al (2005b).
 
 Where is this controlled ?

 		
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