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indexing tables using my owns functions

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Hi every body
 
 Recently i wrote my own function into postgesql... and it works perfecly!!, now i would like use it to index a table like this guy do at the link ( http://www.faqs.org/docs/ppbook/r24254.htm)

but i get the following error

mhc2db=> create index h2iab on precalc (idr(p1,p4,p6,p7,p9,'H-2*IAb'));
ERROR:  functions in index _expression_ must be marked IMMUTABLE
mhc2db=>

in this indexation p1,p4,p6,p7,p9 are variables that depends on the field.

could anyone help me?

--
Pau Marc Muñoz Torres

Laboratori de Biologia Computacional  
Institut de  Biotecnologia   i Biomedicina Vicent Villar                                    
Universitat Autonoma de Barcelona
E-08193 Bellaterra (Barcelona)
              
telèfon: 93 5812807
Email : paumarc.munoz@xxxxxxxxxxxxxx

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