Excel 2007 : excel 2007 to excel 2003 conversion

Hello folks,
I created a worksheet with different functions and macros, using excel 2007. I am trying to make it compatible with excel 2003, but I'm not succeeding.
I think it's necessary that you guys see the worksheet in question.. so here it is. I think the major issues are related to the conditional formatting (which is not big, and I know I can add it in the 2003) but most of all the automatic fill and update of internet data in the cells.
thanks
Andrea