function URLEncode (clearString) {

  var output = '';

  var x = 0;

  clearString = clearString.toString();

  var regex = /(^[a-zA-Z0-9_.]*)/;

  while (x < clearString.length) {

    var match = regex.exec(clearString.substr(x));

    if (match != null && match.length > 1 && match[1] != '') {

     output += match[1];

      x += match[1].length;

    } else {

      if (clearString[x] == ' ')

        output += '+';

      else {

        var charCode = clearString.charCodeAt(x);

        var hexVal = charCode.toString(16);

        output += '%' + ( hexVal.length < 2 ? '0' : '' ) + hexVal.toUpperCase();

      }

      x++;

    }

  }

  return output;

}

function URLDecode (encodedString) {

  var output = encodedString;

  var binVal, thisString;

  var myregexp = /(%[^%]{2})/;

  while ((match = myregexp.exec(output)) != null

             && match.length > 1

             && match[1] != '') {

    binVal = parseInt(match[1].substr(1),16);

    thisString = String.fromCharCode(binVal);

    output = output.replace(match[1], thisString);

  }

  return output;

}