How can I call this method?

[toffmjr]

\[code\] <%@ Page Title="About" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeFile="About.aspx.cs" Inherits="About" %><asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent"> <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script> <script type="text/javascript"> var directionsDisplay; var directionsService = new google.maps.DirectionsService(); function getParameterByName(name) { name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]"); var regexS = "[\\?&]" + name + "=([^&#]*)"; var regex = new RegExp(regexS); var results = regex.exec(window.location.search); if (results == null) return ""; else return decodeURIComponent(results[1].replace(/\+/g, " ")); } function calcRoute() { start = document.getElementById('startvalue').value; end = document.getElementById('endvalue').value; var request = { origin: start, destination: end, travelMode: google.maps.DirectionsTravelMode.DRIVING }; directionsService.route(request, function (response, status) { if (status == google.maps.DirectionsStatus.OK) { directionsDisplay.setDirections(response); this.distance = response.routes[0].legs[0].distance.value / 1000; } }); } function Button1_onclick() { calcRoute(); } window.onload = InitializeMap; </script> <div style="height: 86px; width: 689px; margin-left: 16px; margin-top: 0px"> <table style="width: 96%;"> <tr> <td class="auto-style1"> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </td> <td> <asp:TextBox runat="server" id ="startvalue"></asp:TextBox> </td> <td>&nbsp;</td> </tr> <tr> <td class="auto-style2"> <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label> </td> <td class="auto-style3"> <asp:TextBox runat="server" id ="endvalue"></asp:TextBox> </td> <td class="auto-style3"></td> </tr> <tr> <td class="auto-style1">&nbsp;</td> <td> <input id="Button1" type="button" value="http://stackoverflow.com/questions/15748427/GetDirections" onclick="return Button1_onclick()" /> </tr> </table>\[/code\]I want to call Button1_onclick() function but it doesn't work. This code has no problem. The problem is calling function is wrong. So please, could you tell me how can I do it..