Change background of select options

Change background of select options

Hello,

Im looking to change the background color of a select box.

I want to alternate the the odd/even into different colors. Im not going to know what is in the options as they are derived from a DB.

But I cant get the selector right:
                                                          
 $(document).ready(function() {                           
 $("#SCFILE:option:odd").css("background-color","red");   
 $("#SCFILE:option:even").css("background-color","blue"); 

How would I do all select boxes?

BTW, those are not the colors Im plannign on using, it's just for illustration purposes