Textbox to take only decimal values

<script type="text/javascript">  



    function IsNoDecimal(str) {

        if (isNaN(str) || str.indexOf(".") < 0) {

            alert("Invalid");

        }

        else {

            str = parseFloat(str);

            alert("Entered number is decimal")

        }

    }



    function ValidateInput() {

        var txtBox = document.getElementById('TextBox1');

        var txtboxValue = document.getElementById('TextBox1').value;

        if (txtboxValue == "") {

            alert("Please enter.");

            txtBox.focus();

            return false;

        }

        if (IsNoDecimal(txtboxValue) == false) {

           // num = "";

            txtBox.focus();

            return false;

        }

        return true;

    }

</script>

<div>

     <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

     <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="javascript:return ValidateInput();" />

</div>

Thanks
Tanuja
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