jQuery UI Tabs refreshes after button click - jquery-ui

Question

I have jQuery UI Tabs page:
<div class="addTheatreContainer">
<div class="addTheatreHeader">
<span class="txtLightboxTitle">ADD THEATRE</span>
</div><!--end/ .addTheatreHeader-->
<!-- Tabs -->
<div id="tabs">
<ul>
<li>
1 B.C.
</li>
<li>
2 Alberta
</li>
</ul>
<div id="#tabs-1">
<table class="table5">
<tr>
<td width="20">
<fieldset class="checkboxes">
<label class="label_check">
<input name="ctl10" type="checkbox" />
</label>
</fieldset>
</td>
<td width="40">ID</td>
<td width="120">Location</td>
<td width="120">Region</td>
<td width="120">City</td>
<td width="70">Province</td>
</tr>
</table>
</div>
<div id="#tabs-2">
<table class="table5">
<tr>
<td width="20"><fieldset class="checkboxes"><label class="label_check"><input name="ctl22" type="checkbox" /></label></fieldset></td>
<td width="40">ID</td>
<td width="120">Location</td>
<td width="120">Region</td>
<td width="120">City</td>
<td width="70">Province</td>
</tr>
</table>
</div>
</div><!--end/ #tabs-->
<div class="ButtonAlignRight">
<button id="btnAddAndCloseTheatre" runat="server" class="btnAddandCloseTheatre" >Add & Close</button>
<button id="btnAddTheatre" runat="server" class="btnAddTheatre" onclick="AddLocations()">Add</button>
<button id="btnClose" runat="server" class="btnClose">Close</button>
</div>
</div>
When I click the Add button. The whole page refreshes and I dont want it to since I am storing values in a global variable.
JS:
function AddLocations()
{
var allChecboxes = $("#tabs").tabs("options", "active").find(".checkboxes");
var allCheckedLocations = allChecboxes.find(".cbLocation").each(function () {
var checkbox = $(this);
if (checkbox.prop("checked") == true)
{
var checkboxId = checkbox.attr("id");
var locationId = parseInt(checkboxId.replace("cbLocation_", ""));
if (typeof (locationId) == "number" && isNaN(locationId) == false) {
AddedLocationsList.push(locationId);
}
//checkbox.parents(".row").fadeOut();
}
});
}
AddedLocationsList is a global variable.This function works perfectly but since the page is refreshed the variable is set back to []. I don't know why the page is being refreshed. Is there a jQuery UI callback?