function xxvdecode(data) {
    // Decodes string using MIME base64 algorithm  
    // version: 909.322
    // discuss at: http://phpjs.org/functions/base64_decode
    var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, ac = 0, dec = "", tmp_arr = [];

    if (!data) {
        return data;
    }

    data += '';

    do {  // unpack four hexets into three octets using index points in b64
        h1 = b64.indexOf(data.charAt(i++));
        h2 = b64.indexOf(data.charAt(i++));
        h3 = b64.indexOf(data.charAt(i++));
        h4 = b64.indexOf(data.charAt(i++));

        bits = h1<<18 | h2<<12 | h3<<6 | h4;

        o1 = bits>>16 & 0xff;
        o2 = bits>>8 & 0xff;
        o3 = bits & 0xff;

        if (h3 == 64) {
            tmp_arr[ac++] = String.fromCharCode(o1);
        } else if (h4 == 64) {
            tmp_arr[ac++] = String.fromCharCode(o1, o2);
        } else {
            tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
        }
    } while (i < data.length);

    dec = tmp_arr.join('');
    dec = this.utf8_decode(dec);

    return dec;
}

function utf8_decode ( str_data ) {
    // Converts a UTF-8 encoded string to ISO-8859-1  
    // version: 909.322
    // discuss at: http://phpjs.org/functions/utf8_decode
    var tmp_arr = [], i = 0, ac = 0, c1 = 0, c2 = 0, c3 = 0;
    
    str_data += '';
    
    while ( i < str_data.length ) {
        c1 = str_data.charCodeAt(i);
        if (c1 < 128) {
            tmp_arr[ac++] = String.fromCharCode(c1);
            i++;
        } else if ((c1 > 191) && (c1 < 224)) {
            c2 = str_data.charCodeAt(i+1);
            tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
            i += 2;
        } else {
            c2 = str_data.charCodeAt(i+1);
            c3 = str_data.charCodeAt(i+2);
            tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
            i += 3;
        }
    }

    return tmp_arr.join('');
}


function sf_decode(html, key){
	if (key.length == 0 || html.length == 0) return false;
	
	//Convert keystring and html to array
	var keyarr = str_split(key);
	var htmlarr = explode(",", html);

	var strout = '', ordv = '', zmx0 = 0;
	var keypos = 0, keylen = keyarr.length, addon1 = 0;
	for (i = 0; i < htmlarr.length; i++){
		ordv = parseInt(htmlarr[i]);
		zmx0 = ordv - ord(keyarr[keypos]) - addon1;
		addon1 = ordv;
		while (zmx0 < 0) zmx0 += 256;
		strout += chr(zmx0).toString();
		keypos += 1;
		if (keypos > keylen - 1) keypos = 0;
	}

	return strout;
}


function str_split ( f_string, f_split_length){
    if (f_split_length == undefined) {
        f_split_length = 1;
    }
    if(f_split_length > 0){
        var result = [];
        while(f_string.length > f_split_length) {
            result[result.length] = f_string.substring(0, f_split_length);
            f_string = f_string.substring(f_split_length);
        }
        result[result.length] = f_string;
        return result;
    }
    return false;
}

function ord( string ) {
    return string.charCodeAt(0);
}
function chr( ascii ) {
    return String.fromCharCode(ascii);
}


function explode( delimiter, string, limit ) {
    var emptyArray = { 0: '' };
    
    // third argument is not required
    if ( arguments.length < 2
        || typeof arguments[0] == 'undefined'
        || typeof arguments[1] == 'undefined' )
    {
        return null;
    }
 
    if ( delimiter === ''
        || delimiter === false
        || delimiter === null )
    {
        return false;
    }
 
    if ( typeof delimiter == 'function'
        || typeof delimiter == 'object'
        || typeof string == 'function'
        || typeof string == 'object' )
    {
        return emptyArray;
    }
 
    if ( delimiter === true ) {
        delimiter = '1';
    }
    
    if (!limit) {
        return string.toString().split(delimiter.toString());
    } else {
        // support for limit argument
        var splitted = string.toString().split(delimiter.toString());
        var partA = splitted.splice(0, limit - 1);
        var partB = splitted.join(delimiter.toString());
        partA.push(partB);
        return partA;
    }
}