function str_reverse(str){
var splitext = str.split("");
var revertext = splitext.reverse();
var reversed = revertext.join("");
return reversed;
}

function popUp(thumbnail,percent){
var h;
var w;
var tn;
var dir;
var r = str_reverse(thumbnail);
var i = r.indexOf('/');
if (i < 0) {
  dir = '';
  tn = thumbnail;
} else {
  tn = str_reverse(r.substr(0,i));
  dir  = str_reverse(r.substr(i,r.length));
}
i = tn.indexOf('.');
var title = tn.substr(0,i);
title = title.replace(/_/g,' ');
title = title.replace(/QQ/g,'??');
title = unescape(title);
tn = tn.substr(i+1,tn.length);
i = tn.indexOf('.');
w = tn.substr(0,i);
tn = tn.substr(i+1,tn.length);
i = tn.indexOf('.');
h = tn.substr(0,i);
var s = '<center><img src="'+thumbnail+'" height="'+Math.round(h*(percent/100))
       +'" width="'+Math.round(w*(percent/100))+'">';
s = s + '<br>'+title+'</center>';
return s;
}