Problem in creating dynamic select-options creating from ';' seperated file

Hi all,

My requriement is selection screen fields will come from a flat file like below(first row is field names and remaining r field values)

For example for VBAK table

VBELN;VKORG;VTWEG;SPART

3999202;B227;BD;XX

file can be vary(number of fields) and based on table .

Please let me know how can i convert this file in to the selection-screen fields and how can i pass these values in the select statement WHERE condition....

Thank you very much,

Krishna D