IF/AND in Conditional Formatting

Hi - for starters, I'm working with Excel 2007 with XP Pro...

I'd like to use conditional formatting to highlight in bold red all of the cells in column A that exceed these two conditions:
1) the cell value in column A is > 0.15, AND
2) the cell value in column A is > than the value in the same row in column B; again, both of these conditions must be met.

On the attached spreadsheet, I've demonstrated what I'd like to do. I've tried using the "Format only the cells that contain" Rule Type, but doing this produces many false positives. I think "Use a formula to determine which cells to format" with an IF/AND formula is what I need, but I haven't been able to figure out the correct syntax.

Thanks very much.