Currency (Price) Validation

Give any one of the below query to use Currency (Price) Validation ..

<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>

<script type="text/javascript">

        function checkDecimals(fieldName, fieldValue) {

            decallowed = 2;

            if (isNaN(fieldValue) || fieldValue == "") {

                fieldName.select();

                fieldName.focus();

            }

            else {

                if (fieldValue.indexOf('.') == -1) fieldValue += ".";

                dectext = fieldValue.substring(fieldValue.indexOf('.') + 1, fieldValue.length);

                if (dectext.length > decallowed) {

                  

                    fieldName.select();

                    fieldName.focus();

                }

                else {

                }

            }

        }

    </script>

<input id="txtbox" type="text" name="txt" onkeypress="checkDecimals(this.form.txt, this.form.txt.value)">

                              OR 

<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>

<script src="ariy.validator.js" type="text/javascript"></script>

<script type="text/javascript">

   $(document).ready(function () {

        $('#quantity').ariyValidate({

            type: "price",

            error_message: "Raja"

        });

  });

<input type="text" id="quantity" />

                            OR

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

        <asp:RegularExpressionValidator ID="rev_CashTextBox" runat="server"         

        ValidationExpression="^\$?\-?([1-9]{1}[0-   9]{0,2}(\,\d{3})*(\.\d{0,2})?|[1-9]{1}\d{0,}(\.\d{0,2})?|0(\.\d{0,2})?|(\.\d{1,2}))$|^\-?\$?([1-9]{1}\d{0,2}(\,\d{3})*(\.\d{0,2})?|[1-9]{1}\d{0,}(\.\d{0,2})?|0(\.\d{0,2})?|(\.\d{1,2}))$|^\(\$?([1-9]{1}\d{0,2}(\,\d{3})*(\.\d{0,2})?|[1-9]{1}\d{0,}(\.\d{0,2})?|0(\.\d{0,2})?|(\.\d{1,2}))\)$"        ControlToValidate="TextBox1"ValidationGroup="vld_Edit"

ErrorMessage="*" ForeColor="Red"  Display="Dynamic" ToolTip=""/>

<asp:Button ID="Button1" runat="server" Text="Button" 

   ValidationGroup="vld_Edit" onclick="Button1_Click" />