[javascript] How to call javascript function from asp.net button click event

How do I call the showDialog from a asp.net button click event. My page is a contentpage that has a masterpage associated with it.

I have tried the following

<asp:Button ID="ButtonAdd" runat="server" Text="Add" 
                            OnClientClick="showDialog('#addPerson');" />
  <asp:Button ID="ButtonAdd" runat="server" Text="Add" 
                            OnClientClick="showDialog(#<%=addPerson.ClientID %>);" />

I am also going to have to call this same function from a gridview template button to modify the record on the dialog.

<script type="text/javascript">


    // Used the following example to open the dialog withJquery 
        var dl;
        $(document).ready(function () {

            //Adding the event of opening the dialog from the asp.net add button.
            //setup edit person dialog             
            $('#addPerson').dialog({
                //Setting up the dialog properties.
                show: "blind",
                hide: "fold",
                resizable: false,
                modal: true,
                height: 400,
                width: 700,
                title: "Add New Member",
                open: function (type, data) {
                    $(this).parent().appendTo("form:first");
                }
            });

            //setup edit person dialog             
            $('#editPerson').dialog({
                //Setting up the dialog properties.
                show: "blind",
                hide: "fold",
                resizable: false,
                modal: true,
                height: 400,
                width: 700,
                title: "Modify Member",
                open: function (type, data) {
                    $(this).parent().appendTo("form");
                }             
            });



            function showDialog(id) {
                $('#' + id).dialog("open"); 
            } 



    //        function closeDialog(id) {
    //            $('#' + id).dialog("close"); 
    //        } 

            //Adding a event handler for the close button that will close the dialog 
            $("a[id*=ButtonCloseDlg]").click(function (e) {
                $("#divDlg").dialog("close");
                return false;
            });
        });

       </script>

Tried to call the jquery dialog from a gridview editbutton and get the same error Object doesnt support this property or method?

<input type="submit" name="ctl00$ContentPlaceHolder1$GridViewMembers$ctl02$Button1" value="Edit" onclick="showDialog(&#39;addPerson&#39;);" id="ContentPlaceHolder1_GridViewMembers_Button1_0" />

You're already prepending the hash sign in your showDialog() function, and you're missing single quotes in your second code snippet. You should also return false from the handler to prevent a postback from occurring. Try:

<asp:Button ID="ButtonAdd" runat="server" Text="Add"
    OnClientClick="showDialog('<%=addPerson.ClientID %>'); return false;" />