Highlighting Duplicate Cells

Hello,
In my spreadsheet column A contains thousands of cells containing names , some of which are duplicate names. In column J I have a seperate list of names, some of which are also in column A. I want to highlight a cell in column A if the name in it is the same as one of the names in a cell from column J.

I need to be able to quickly look at a name in column J and be able to indicate how many time that name shows up in column B, if the name shows up at all.

This task is performed on a monthly basis so it would be great to figure out a less time consuming way of doing this.

Thank you for any help!

Thanks newdoverman, that works!

Actually, the conditional formatting didn't quite work. What I want to do seems so simple, yet I can't figure it out for the life of me, which is driving me crazy.
Thanks for your help, do you happen to have any other ideas?