HTML redirect to mobile web page automatically

When the user or the client visit your website, if they see your web without any responsively it might be problem. Because the contents are may be not in the right places. So the right and most used way is to redirect them to separated mobile page. So here is the simplest source code to do that (in a javascript).

 if (document.location.search.indexOf("skipmobile") >= 0) { 
 document.cookie = "skipmobile=1"; 
 } 
 else if ((document.location.hostname.match(/\.mobi$/) || screen.width < 699) 
 && document.cookie.indexOf("skipmobile") == -1) 
 { 
 document.location = "mobile/"; 
 }