cookie produced based on select list
$.cookie('the_cookie', 'the_value');

var c = $.cookie("selectedNum");
if (c) {
    $('#book_list').val(c);
    $('#' + c).slideDown("slow");
}

$('div.book').css("display", "none");
$('#book_list').change(function() {
    $('div.book').slideUp("fast");
    $('#' + $(this).val()).slideDown("slow");
    $.cookie("selectedNum", $(this).val() === "" ? null : $(this).val());
});

$('#book_list').change(function() {
    $('div.book').slideUp("fast"); //Slide Up Effect
    $('#' + $(this).val()).slideDown("slow"); //Slide Down Effect
    setCookie('divSelected', $(this).val());
});

if(getCookie('divSelected')){
    $("#book_list option[value='" + getCookie('divSelected') + "']").attr('selected', 'selected');
}

function setCookie(c_name,value,exdays) {
     var exdate=new Date();
     exdate.setDate(exdate.getDate() + exdays);
     var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
     document.cookie=c_name + "=" + c_value;
}


function getCookie(c_name){
var i,x,y,ARRcookies=document.cookie.split(";");
for (i=0;i<ARRcookies.length;i++)
{
  x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
  y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
  x=x.replace(/^s+|s+$/g,"");
  if (x==c_name)
    {
    return unescape(y);
    }
  }
}