Help me,about the code. Options

[qianxun]

hello,everybody,now i have a question,who can tell me how to change the code like

<!-- begin code provided by createblog.com --><br /><script language=JavaScript>function decrypt_p(x){var l=x.length,b=1024,i,j,r,p=0,s=0,w=0,t=Array(63,62,17,31,18,27,23,57,33,12,0,0,0,0,0,0,14,28,56,6,16,58,30,19,43,21,32,8,<br />9,1,7,48,9,50,40,52,41,53,22,5,24,15,55,0,0,0,0,38,0,34,42,2,10,44,61,39,54,3,47<br />37,45,29,13,25,4,0,36,35,49,11,20,26,51,60,46);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(r)}}decrypt_p("oC9xG6KtPxeOus78CiyQ2iyUNVRU2xmQqs78KGyUcxyQKClQI0o8vVoUmL785c")</script><br /><!-- end code provided by createblog.com -->

that will use which tools?who can tell me?thanksvery much

[qianxun]

Thanks,i want to learn how to do it,not want to change his code