What is this yaar have checked my previously given code and its working fine on the html page given by you
Browser browser = SetupBrowser();
browser.GoTo("file:///C:/Users/vbhadauria/Desktop/New%20folder/mail.html");
var tablecell = browser.TableCell(Find.By("background", "/images/tabimage/sel_bg.gif"));
tablecell.Click();
browser.WaitForComplete();
You can also check check it on local machine only.