Hiding Columns using VBA

Hi

I'm trying to hide specific columsn in my worksheet based on the value in cell B3

This is my code at the moment

Please Login or Register  to view this content.

But it doesn't seem to work?

Am I missing something? I need it to hide the certain columns every time cell b3 is changed as there are a lot of helper columns in the sheet which make for messy reading and reporting

Thanks

Dan