Disable Dates Using Jquery Inside Gridview Control?

I have a gridview which contains a textbox control. I need to show the calendar for the user to pick the date and certain dates are to be disabled using jquery. I found a post on stackoverflow that talked about how to disable certain dates. I am done with that part, except not sure how to pass the textbox control to this jquery function. Here is the code.

<script type="text/javascript" language="javascript">
function pageLoad(sender, args) {
var enabledDays = ['09/21/2011', '10/05/2011', '10/19/2011', '11/02/2011', '11/16/2011'];
/* utility functions */
function editDays(date) {
for (var i = 0; i < enabledDays.length; i++) {
if (new Date(enabledDays[i]).toString() == date.toString()) {
return [true];
}
}
return [false];
}
/* create datepicker */
$(document).ready(function() {
$('#<%= txtInHomeDate.ClientID %>').datepicker({
beforeShow: springDate,
beforeShowDay: editDays,
dateFormat: 'mm/dd/yy',
buttonImage: 'images/cal.gif',
buttonText: 'Choose date',
firstDay: 1,
buttonImageOnly: true,
showOn: 'both',
showAnim: 'fadeIn',
onSelect: function() { $(this).trigger("onchange", null); }
});
function springDate() {
var defaultMin = new Date();
var defaultMax = new Date();
var Min = defaultMin;
var Max = defaultMax;
// make valid date from hiddenfied value format is MM/dd/yyyy
dateMin = $('#<%= hfStDate.ClientID %>').val();
dateMin = new Date(dateMin);
dateMax = $('#<%= hfEndDate.ClientID %>').val();
dateMax = new Date(dateMax);
if (dateMin && dateMax) {
Min = new Date(dateMin.getFullYear(), dateMin.getMonth(), dateMin.getDate());
Max = new Date(dateMax.getFullYear(), dateMax.getMonth(), dateMax.getDate());
}
return {
minDate: Min,
maxDate: Max
};
}
});
}
<....
<asp:TemplateField HeaderText="In-Home Date">
<ItemStyle HorizontalAlign="Center" />
<ItemTemplate>
<asp:HiddenField ID="hfStDate" runat="server" Value="09/01/2011" />
<asp:HiddenField ID="hfEndDate" runat="server" Value="11/30/2011" />
<asp:TextBox ID="txtInHomeDate" runat="server" />
</ItemTemplate>
</asp:TemplateField>

Currently, it errors out since the jquery function won't find the txtInHomeDate.