Hm, I've got a box of 0.1uF capactiors, would that work?

... And I'm not clear on which direction (plus or minus) the leads are supposed to go in the schematic. For that matter, I'm not sure which leads are plus or minus on these capactiors. They're little ceramic jobbies, ratshack part number 272-109a. It's not like an LED where one lead is longer than the other, they're both the same length...