IF and OR function combination

I need help on the following problem:

I have 2 cells with numbers.
In a 3rd cell I want to create a formula which looks at the 2 data cells and shows a value. The rules are the following:
If C1 or C2 are bigger than Xthen C3=value1 else C3=value2
I have some basic excel knowledge but im not very familiar with functions, so please help me out on this one.
I'm using Excel 2007.

Thanks in advance!