You will need to pass the form values. Simply submit the form and then detect if the request.form fields have values and print them if so EG:
Code:
<input type="text" name="cName" size="27" <% if trim(request.form("cName")) <> "" then %> value="<%= trim(request.form("cName")) %>" <% end if %> title="Enter your name, this field is required." maxlength="50">
IMO the window.history.go(-1); part of the code you have is not idel, if I were you I would use pure ASP code. here is where you can get very good Pure classic ASP code you are looking for. its the one I use:
http://www.tipstricks.org/