jquery only allow input float number

$(document).ready(function () {

        $('#<%= txtPrice.ClientID  %>').keypress(function (event) {

            if ($.browser.mozilla == true) {

                if (event.which == 8 || event.keyCode == 37 || event.keyCode == 39 || event.keyCode == 9 || event.keyCode == 16 || event.keyCode == 46) {

                    return true;

                }

            }

            if ((event.which != 46 || $(this).val().indexOf('.') != -1) && (event.which < 48 || event.which > 57)) {

                $("#errmsg").html("Price Only").show().fadeOut("slow");

                event.preventDefault();               

            }

        });

       

    });

<asp:TextBox ID="txtPrice" Width="80px" runat="server"></asp:TextBox>

                        &nbsp;<span id="errmsg" style="color:Red;"></span>