expanded bookmarklet code to unescape selected text or text provided in a prompt

unescape-bookmarklet.js

sel= function (){
  if (window.getSelection){
    return window.getSelection();
  }else if (document.getSelection){
    return document.getSelection();
  }else if (document.selection){
    return document.selection.createRange().text;
  }else return;
};
if (sel()!=""){
  alert(unescape(sel()));
}else{
  alert(unescape(prompt("Text to unescape","No text selected")));
}