Go to Filters in PS, scroll down to sharpen, then choose unsharp mask from the submenu. Keep your level very low and experiment from there. There are good books that make recommendations about the numbers and methods to choose for unsharp mask, and if you have PS or PS Elements, look at the book that came with it.
Thankyou tootsie, and thanks etfon911 I will give it a go. I should read my manual (but is thick!!)in the evening. As I have a 2 and 3 1/2 year old, and they give me such little time in the day...and need the rest in the evening..lol..but thanks