Filter Pivot Tables By Values

Hi,

I have a Pivot Table which looks something like this:

-------------------Links
Sites ---- Ok ---- #N/A
abc.com ---1,479 --- 10,517
xyz.com --- 517 ---244
dfas.com ---548 --- 892
htfh.com --- 845 --- 218

What I'd like to be able to do is filter the data by two conditions; e.g. where OK is greater than 500 and #N/A is less than 750.

I can't seem to be able to work out a way of doing this easily. If it was plain data the I could do it with a couple of filters but by necessity it's a Pivot.

I had a search on here but couldn't see anything which looked like what I'm trying to accomplish.

Any help appreciated :-)