/* Copyright (c) 2006 Mathias Bank (http://www.mathias-bank.de)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
* 
* Thanks to Hinnerk Ruemenapf - http://hinnerk.ruemenapf.de/ for bug reporting and fixing.
*/
function URLEncode(unencodedValue, norwegian) {
    // The Javascript escape and unescape functions do not correspond
    // with what browsers actually do...
    var SAFECHARS = "0123456789" + 				// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" + // Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()"; 				// RFC2396 Mark characters
    var HEX = "0123456789ABCDEF";

    var plaintext = unencodedValue;
    var encoded = "";
    for (var i = 0; i < plaintext.length; i++) {
        var ch = plaintext.charAt(i);

        
        if (norwegian.indexOf(ch) != -1) {            
            encoded += ch;
        }
        else if (ch == " ") {
            encoded += "+"; 			// x-www-urlencoded, rather than %20
        } else if (SAFECHARS.indexOf(ch) != -1) {        
            encoded += ch;
        } else {
            var charCode = ch.charCodeAt(0);
            if (charCode > 255) {
                alert("Unicode Character '"
                        + ch
                        + "' cannot be encoded using standard URL encoding.\n" +
				          "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted.");
                encoded += "+";
            } 
            else {
                encoded += "%";
                encoded += HEX.charAt((charCode >> 4) & 0xF);
                encoded += HEX.charAt(charCode & 0xF);
            }
        }
    } // for

    return encoded;
};

function URLDecode(encodedValue) {
    // Replace + with ' '
    // Replace %xx with equivalent character
    // Put [ERROR] in output if %xx is invalid.
    var HEXCHARS = "0123456789ABCDEFabcdef";
    var encoded = encodedValue
    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 {
                alert('Bad escape combination near ...' + encoded.substr(i));
                plaintext += "%[ERROR]";
                i++;
            }
        } else {
            plaintext += ch;
            i++;
        }
    } // while
    return plaintext;
};
jQuery.extend({
    /**
    * Returns get parameters.
    *
    * If the desired param does not exist, null will be returned
    *
    * @example value = $.getURLParam("paramName");
    */
    getURLParameter: function(strParamName) {
        var strReturn = "";
        var strHref = window.location.href;
        var bFound = false;

        var cmpstring = strParamName + "=";
        var cmplen = cmpstring.length;

        if (strHref.indexOf("?") > -1) {
            var strQueryString = strHref.substr(strHref.indexOf("?") + 1);
            var aQueryString = strQueryString.split("&");
            for (var iParam = 0; iParam < aQueryString.length; iParam++) {
                if (aQueryString[iParam].substr(0, cmplen) == cmpstring) {
                    var aParam = aQueryString[iParam].split("=");
                    strReturn = URLDecode(aParam[1]); //should decode url string
                    bFound = true;
                    break;
                }

            }
        }
        if (bFound == false) return null;
        return strReturn;
    }
});
jQuery.extend({
    setURLParameter: function(url, parameterName, parameterValue) {
        return url + "?" + URLEncode(parameterName) + "=" + URLEncode(parameterValue);
    }

});
jQuery.extend({
    appendURLParameter: function(url, parameterName, parameterValue) {
        return url + "&" + URLEncode(parameterName) + "=" + URLEncode(parameterValue);
    }

});