JavaScript URL Decode function

Here is a complete function (taken from PHPJS):

function urldecode(str) {
   return decodeURIComponent((str+'').replace(/\+/g, '%20'));
}

I've used encodeURIComponent() and decodeURIComponent() too.

Use this

unescape(str);

I'm not a great JS programmer, tried all, and this worked awesome!

decodeURIComponent(mystring);

you can get passed parameters by using this bit of code:

//parse URL to get values: var i = getUrlVars()["i"];
function getUrlVars() {
    var vars = [], hash;
    var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    for (var i = 0; i < hashes.length; i++) {
        hash = hashes[i].split('=');
        vars.push(hash[0]);
        vars[hash[0]] = hash[1];
    }
    return vars;
}

Or this one-liner to get the parameters:

location.search.split("your_parameter=")[1]