set background image on a table cell in codebehind

I want to set the background image of a table cell. i have an html table and I am using the runat=server.
 CType(tblMain.FindControl("tdSecondWeek"), HtmlTableCell).BgColor = "white"

the above works to set the bgcolor but I want to set a background image and then toggle between two different images. to give the appearance of active tabs like on this website.

please help


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Elvio Lujan.Net Senior DeveloperCommented:
CType(tblMain.FindControl("tdSecondWeek"), HtmlTableCell).background = "file.gif"

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