How do I set mouse double click speed in Lubuntu

I'm using Lubuntu 11.10. The only problem I have that the mouse double click speed is a bit high (it seems to me that it is around 100-200ms) and I would like it to set it to around 500ms. Is there a way to do it? I tried using Openbox Configuration Manager but that only changes the double click speed for window headers. But in PCManFM for example it is still around 200ms