Client Side Validation in Grid View

Question

Hi,

I have a web form which has a Grid view with item templates like check box, list item, etc followed by approve and reject buttons at the bottom.

User can select the check boxes and thereby approve or reject the same. Validation should be such that, a item is selected from list box against every selected check box for approval and remarks should be entered against every selected check box for rejection.

This can be easily validated at the server end but, i am unable to do the same at client side. Inputs are always welcome :)