How to pass variable in the place of numeric value?

Hi,
my requirement is i want to validate the selection screen block width.
I have created tabbed selection screen.
i need in which variable tab lengh values will be stored
ex:-
selection-screen: begin of tabbed block MYTAB for 10 lines,
TAB (20) button1 USER-COMMAND push1,
TAB (20) button2 USER-COMMAND push2,
end of block MYTAB.
here in the above code i want to pass variable instead of directly numeric value as 10.
because based on some conditions i want to change the number of lines.
how to do this...plz urgent, i will give all the points to anybody who given good answer.
Thanks in Advance,
venkat n

Hi!
And that's why God created macros.
DEFINE seltab.
selection-screen: begin of tabbed block MYTAB for &1 lines,
TAB (20) button1 USER-COMMAND push1,
TAB (20) button2 USER-COMMAND push2,
end of block MYTAB.
END-OF-DEFINITION.
DATA: lv_lines TYPE i VALUE 10.
seltab lv_lines.
Regards
Tamá

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