backgroundHelper.js

var backgroundHelper = {
    // Converts a UTF-8 encoded string to ISO-8859-1  
    // 
    // version: 905.3122
    // discuss at: http://phpjs.org/functions/utf8_decode
    // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
    // +      input by: Aman Gupta
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Norman "zEh" Fuchs
    // +   bugfixed by: hitwork
    // +   bugfixed by: Onno Marsman
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: utf8_decode('Kevin van Zonneveld');
    // *     returns 1: 'Kevin van Zonneveld'
	utf8decode: function(str_data) {
	    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('');
	}
};