checkbox problem

i have a checkbox, shown below

<asp:checkbox Checked="false" ID="chkTelephoned" Vaule="Yes" runat="server"
Text="Telephoned" TextAlign="right" ToolTip="Please check here if client
Telephoned" />

when we click on the submit button it runs code to send an email and is
formatted into a table with the relevant information, the problem i am
having is that all the checkboxes show "on" when they are checked, this does
not make sense for the staff receiving the email and i would like to change
it to "yes" instead of on, is there a way to do this

code for the email side

strBody = strBody & "<tr><td><b>Telephoned:</b></td>"
strBody = strBody & "<td>"
strBody = strBody & Trim(Request.Form("chkTelephoned"))

any help would really be appreciated

thank you