JQuery :: Passing Session Values To The Mother Page?

I have a question here, I have a mother page of 2 divs, one for the category list of foods on the left and the right div is a placeholder for the selected food of the category,

Then i have a modal box, which loads the list of foods associated to the category when clicked,

What i wanted to do is, when i select a food from the modal box and click submit, I wanted to populate the selected food into the right div of the mother page, so far the farthest i went is loading the list of food into the modal window,

its like a shopping cart, but instead of redirecting your users to another page, you display all their orders on the same page... can this be achieve, im using jquery+php sessions