<script type="text/javascript">
<!--
if (screen.width <= 699) {
document.location = "https://yoursite/m";
}
//-->
</script> 

<script language=javascript>
<!--
if ((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))) {
   location.replace("https:/yoursite/m");
}
-->
</script>