Can't modify select option value

Here is my problem, in a single product page:
http://yardenharel.triplebit.com/product/9350/
I need to modify the value of the select boxes in the bottom right(upon initila page load).
Is it possible and how with Css or With Javascript?
Thx

change propiety of a selected option in a select

how can change background-color propiety of a selected option in a select list with CSS?

option: ??? {background-color:white;}

1st
2nd
3rd

Is posible change the background color of selected option ?

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