Confirm Dialog box Cancel not working/?

Hi,
In my confirm dialog box even though when I click cancel btton the post back occures to redirect the page.
<%# ((String.Equals(DataBinder.Eval(Container.DataItem, "Partner_Name").ToString(), "ABC", StringComparison.CurrentCultureIgnoreCase)) && (String.Equals(DataBinder.Eval(Container.DataItem, "Status").ToString(), "YES", StringComparison.CurrentCultureIgnoreCase)) && Convert.ToBoolean(DataBinder.Eval(Container.DataItem, "Is_Deleted_YN")) == false) ? "<a onclick=\"return (confirm('Are You Sure?'));\" href=CheckMe.aspx?username=" + DataBinder.Eval(Container.DataItem, "User_Name").ToString() + "&cid=" + DataBinder.Eval(Container.DataItem, "E_ID").ToString() + "&KeepThis=true&TB_iframe=true&height=480&width=650 class=\"box\" + \">&nbsp;&nbsp;Reject< ...