CODING FOR CHECK BOX

HELLO EXPERTS,

In the selection screen i am having one check box called 'Blind', and when i execute the report i am getting the output with around 15 fields

so if the user checks this check box then i should hide the two fields in the output that is i should show only 13 fields... those fields r ( EKES-MENGE, eket-wemng )

can anyone guide me how to write the logic for it....

Thanks alot for your anticipation...

SIRI