JavaScript

function UrlEncode (strinput) {
        var outcome = new String(strinput);
        var replacements = ['%21', '%2A', '%27', '%28', '%29', '%3B', '%3A', '%40', '%26', '%3D', '%2B', '%24', '%2C', '%2F', '%3F', '%25', '%23', '%5B', '%5D'];
        var entities = ['!', '*', '\'', '(', ')', ';', ':', '@', '&', '=', '+', '$', ',', '/', '?', '%', '#', '[', ']'];

        var i = 0;
        for (i = 0; i < entities.length; i++)
            outcome = outcome.replace(entities[i], replacements[i]);

        return outcome;
    }