JQuery :: Check If A Table's First Row Is Even Or Odd?

i have a table that displays items for my shopping cart. i use ajax and prepend the added item to the table. For my employees sake,i zebra stripe the rows to make the cart easier to view and i highlight the first row in a blue color. When my employee scans an item it is prepended to the table so its always first.

when a new item is scanned i prepend it to the table highlighted. when another item is scanned i am able to remove the highlight of the previous scanned item and add highlight to the new scanned item. my problem is, after i remove the highlight it makes the background white and for everyother item scanned after. The logic im thinking is after i remove the highlight, check wether to see if the row is odd or even and to color it white or the zebra stripped color. Is there a better way to do this. otherwise i would like to know how to check if the row is even or odd.