Dynamic radio button selection

HI Experts,

                I have one requirement i.e I have two radio buttons and two internal tables in the prorgram.

I have to pass this internal tables based on the radio button selection as follows.

if rad1 = 'X'.

then i have to pass first internal table to the grid function module.

else.

second internal table.

but here i have to use the grid function module only one time and based on radio button selection

i have to pass appropriate internal table to the function module.plz suggest me some solution.

thanks.