How to get the backcolor of dynamically created table cell?

Hi,
I am unable to reterive dynamically created table cells back color which has been changed by the click event of the cell.
I am adding table cells dynamically on asp.net page and also setting cells back color. So when the page is loaded, table has number of cells with different colors.Table cells back color can be changed by clicking on it through java script. 
On page post back event, i am jutst getting those colors which were set before the click event.
For example:
When the page is loaded, cell1= red and cell2=red.
If i click on cell2 then it will change to blue so now cell1= red and cell2 = blue
but on post back i am getting cell1= red and cell2 = red.
Table is recreated on post back event.
Any ideas?
Thanks
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