Changing a cell referent in a formula several at a time...

I have a workbook with 10 worksheets all which I use a fomrula that references a page called data. How can I change a cell reference linked to another page on several same type formulas without having to go to each formula and change that specific reference to a cell? For example, the formula now reads =IF(+data!B16=3,C16,"") and I now want all the formulas to reference the column a in place of b instead? =IF(+data!A6=3,C16,"") do I have to do this individually ? Any help greatly appreciated...
JE

Use the Find - Replace All feature

First - MAKE A BACK-UP COPY OF YOUR FILE JUST IN CASE!!!!!

Go to Edit - Find (or do Ctrl+F)

In the "Find what" area type: =IF(+data!B

Select Formulas in the "Look in" drop down list

Click on Replace

In the "Replace with" area type: =IF(+data!A

Now click Replace All

Thanks- that was easy!

You're welcome.