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javascript to avoid particular invalid character in textbox

Suppose we have a testbox and you dont want to allow comma in the textbox.Below is the code to do so :

 function checkKey(ele, event) {
            var v = ele.value.substring(0, ele.value.length);

            if (event.keyCode == 188) {
                alert("Invalid Character");
                $("#<%=lccode.ClientID %>").val(v);
            }

            else {
                return true;
            }

        }

And here us the textbox code to call function :

     <asp:TextBox ID="lccode" runat="server" Width="200px" TextMode="MultiLine" Height="30px"
                            onKeyDown="checkKey(this,event)"></asp:TextBox>

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