How to change The Background Color of td in repeater control

[sanam]

I m using repeater conrol.In this repeater control i m using many other controls like labels,
checkboxes and textboxes.CheckBoxes on one of my column are visible by defult.In some
cases i m setting these check boxes as "visible=ture" these check boxes exsist within a td cell in repeater
control.I want to set background color of that td which have a checked checkbox. I was able to change the
background color of checkboxes but it is not looking gud.My question is how can we change the
background color of whole td on which checkbox is true/checked?
I m checking checkBox in codebehind file, and also i want to set the background color of td from code behind file.

i vl appreciate ur help

thanx..........