Asp Code
<asp:GridView ID="gvList" runat="server" AutoGenerateColumns="False" BorderWidth="0px" ShowHeader="False">
  <Columns>
    <asp:TemplateField>
      <ItemTemplate>
        <cc2:InlineEditBox
          ID="ieData"
          runat="Server"
          Text='<%# Eval("vcComment") %>'
          CallBackOnBlur="True"
          CallBackFunction="Update(/////What goes here?/////)" />
        <asp:HiddenField ID="hfTaskID" runat="server" Value='<%# Eval("vcTaskID") %>' />
      </ItemTemplate>
      <ItemStyle Width="250px" />
    </asp:TemplateField>
  </Columns>
</asp:GridView>

JavaScript Code
function Update(TaskID, Comment) {
  WebService.UpdateComments(Comment, TaskID);
  return(true);
}

I was able to figure out enough on my own to get this working. I set the CallBackFunction="Update()" in the Asp code and used function Update(result, referrer) in the JavaScript code to get the values. It works fine now, but if anyone can point out better techniques I'd appreciate it. Thanks!