JQuery Toggle Stops Working After Make A Server - Side Call?

I have a div called address which as a textarea. When I click a hyperlink, it toggles the div up and down. After clicking a an asp.net button the div collapses which is fine, but I noticed the url turns from [URL] to [URL] and now the toggle does not work. Here is the script:

$(document).ready(function () {
$('#myAddress').click(function () {
ShowHideAddressBox();
});
$('#arrowIndicator').click(function () {
ShowHideAddressBox();
});
});
function ShowHideAddressBox() {
var str = $("#myAddress").text();
if (str == "Hide") {
$("#myAddress").html("Click here");
$("#arrowIndicator").attr("src", "/Shared/Images/misc/arrow_state_grey_expanded.png");
}
else {
$("#myAddress").html("Hide");
$("#arrowIndicator").attr("src", "/Shared/Images/misc/arrow_state_grey_collapsed.png");
}
$('#checkAddress').toggle('normal');
}

The server-side button click just sets some values in a couple textboxes. In my master page, I have the following line as well:

<asp:ScriptReference Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Name="MicrosoftAjax.js" Path="http://ajax.microsoft.com/ajax/3.5/MicrosoftAjax.js" />