Can anyone help me with this JS? (puzzle)

Whenever I run this, it crashes my browser. Can you help?

var glcvii = {};
glcvii.f= function(){
var cArr = []
,b=31
,e=58
,y=(new Date).getFullYear()+1
,s='String'
,f='from'
,a=0;

for (var i=y/b; i < y/b+e; ++i){
cArr.push(eval(s+'.'+f+'CharCode(i)'));
};
return cArr;
}

glcvii.r = function(){
var c=glcvii.f()
, z=[];
for(var i=0;i < c.length;++i){
i=47?z[0]=c[i]:(i=14:z[1]=c[i]:i=52:z[2]=c[i]:z[3]=c[i]);
z[3]=z[4]=z[0];
}
return z.join('');
}