linkbutton is not working on second click ?

i have a datalist which gets populated depending on the selection through,link button and radio buttons...

..the link button passes the categoryid parameter,radio button-rblbrands passes the brand parameter

and last radio button-rblpricerange passes the price parameter....

when the page loads,and i scroll selecting any thing,the scroll works fine...but when i click any link button

second time,the categoryid,PageIndex and the PageCount doesn't changes,it holds the value of

previos selection ..

var pageIndex = 1;

var pageCount;

var categoryid = 0;

var brandtext = null;

var pricevalue = 0;

$(document).ready(function () {

$(window).scroll(function () {

if ($(window).scrollTop() == $(document).height() - $(window).height()) {

GetRecords();

}

});

$('.clbtnmenu').click(function () {

categoryid = $(this).data('id');

pageIndex = 1;

});

function GetRecords() {

pageIndex++;

/*retrieving Text from rblbrands if checked*/

if ($('#<%=rblbrands.ClientID %> input:checked').val() != null) {

var checked_radiobrands = $("[id*=rblbrands] input:checked");

//brandsvalue = checked_radiobrands.val();

brandtext = checked_radiobrands.closest("td").find("label").html();

}

if ($('#<%=rblpricerange.ClientID %> input:checked').val() != null) {

var checked_radioprice = $("[id*=rblpricerange] input:checked");

pricevalue = checked_radioprice.val();

//pricetext = checked_radioprice.closest("td").find("label").html();

}

alert('PageIndex : ' + pageIndex + ' , Page Count : ' + pageCount + ' , CategoryId : ' + categoryid + " , BrandText : " + brandtext + " , PriceValue :" + pricevalue);

if (pageIndex == 2 || pageIndex <= pageCount) {

$("#loader").show();

$.ajax({

type: "POST",

url: "WebForm1.aspx/GetCustomers",

data: JSON.stringify({ 'pageindex': pageIndex, 'categoryid': categoryid, 'brand': brandtext, 'price': pricevalue }),

contentType: "application/json; charset=utf-8",

dataType: "json",

success: OnSuccess,

failure: function (response) {

alert('Hell 1');

error: function (response) {

alert('Hell 2');

}

});

}