Generic sorting functions for portal

Hi everybody,

in my application (CalamarBilling) i have created a few layouts with portal. In the corresponding table, i have 3 special fields for sorting sort_criterion (a number, global storage), sort_field_text (a text) and sort_field_number (number). In the definition of sort_field_text and sort_field_number, i calculate the content depending on the sort_criterion. In the portal definition, i sort first by sort_field_number and then sort_fiel_text. I have a script that is executed with a parameter that automatically fills the field sort_criterion and calls the function replace field content in order to activate the calculation of the sort_field_xx. This works perfectly but i need to define a different script for every portal.

Can someone help how to define a script that is globally define with one parameter (sort criterion) ?

Thank you for any answer

Eva La Star