// JavaScript Document
function URLDecode(cadena){
	var HEXCHARS = "0123456789ABCDEFabcdef";
	var encoded = cadena;
	var plaintext = "";
	var i = 0;
	while (i < encoded.length) {
		var ch = encoded.charAt(i);
		if (ch == "+") {
			plaintext += " ";
		i++;
		} else if (ch == "%") {
			if (i < (encoded.length-2)
				&& HEXCHARS.indexOf(encoded.charAt(i+1)) != -1
				&& HEXCHARS.indexOf(encoded.charAt(i+2)) != -1 ) {
				plaintext += unescape( encoded.substr(i,3) );
			i += 3;
			} else {
				plaintext += "%[ERROR]";
			i++;
			}
		} else {
			plaintext += ch;
			i++;
		}
	} // while
	return plaintext;
}