flip string but remain readable

String.prototype.flip = function()
{
	var result = new Array(this.length)
 
	var flipTable = { 
        '\u005B':'\u005D', '\u0061':'\u0250', '\u0063':'\u0254', '\u0065':'\u01DD',
        '\u006D':'\u026F', '\u006E':'\u0075', '\u0075':'\u006E', '\u0072':'\u0279',
        '\u0074':'\u0287', '\u0076':'\u028C', '\u0077':'\u028D'
	}
 
	var last = this.length - 1;
	for (var i = 0; i <= last; i++) {
		var c = this.charAt(i);
		var r = undefined;
 
		if( i !== 0 ) r = flipTable[c];
 
		// console.log("i:"+i+" c:"+c+" last:"+last+" r:"+r);
		result[i] = r != undefined ? r : c;
	}
	return result.join('')
}