Web Forms :: Javascript Function Expected Error?

I'm using the CustomValidation Function to call my javascript but for some reason I'm not getting the * to indicate the error to the user. I keep getting a Function expected Error, so what is wrong with my javascript that's causing this error and why aren't I receiving the * notification?

Javascript:

<script type="text/javascript" language="javascript">
function checkAGITotal()
{
var a = document.getElementById('<%= NumberInHouseholdTxtbox.clientid %>').value;
var b = document.getElementById('<%= AGITotalTxtbox.clientid %>').value;
if (a == "1" && b <= "27247" || a == "2" && b <= "35630" || a == "3" && b <= "44014" || a == "4" && b <= "52397" || a == "5" && b <= "60781" || +
a == "6" && b <= "69164" || a == "7" && b <= "70736" || a == "8" && b <= "74020" || a == "9" && b <= "81500" || a == "10" && b <= "88980" || +
a == "11" && b <= "96460" || a == "12" && b <= "103940")
return true;
else
return false;
}
</script>
vb.net code:
Total: $<asp:TextBox ID="AGITotalTxtbox" runat="server" Width="116px"></asp:TextBox>
<asp:CustomValidator ID="AGITotalValidator" runat="server"
ControlToValidate="AGITotalTxtbox" ErrorMessage="Your household income exceeds the maximum allowed."
ClientValidationFunction="checkAGITotal()" SetFocusOnError="True">*</asp:CustomValidator>