re.js

(function(){
	if( document.referrer )
	{
		var tag = document.createElement('a');
		tag.href = document.referrer ;
		[
			[ ['123.com','www.123.com'] , '111.com' ],
			[ ['456.com','www.456.com'] , '222.com' ],
		].forEach(function(e){
			if( e[0].indexOf(tag.hostname) != -1 )
				location.href = 'http://' + e[1] ;
		});
	}
})();