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if (navigator.appName.indexOf("Explorer") != -1){  window.location = "index.php/?navi=ie";}

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<?php if($_GET['navi']=="ie") 
 {  include_once "navi_ie.php";  } ?>

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var i=0;  if (navigator.appName.indexOf("Explorer") != -1)
{  i++;  if (i<2)  {  window.location = "index.php/?navi=ie";  }}

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<?php if (!isset($_GET["navi"])) # if not!
    echo "<script>/*dein reload-script goes here*/</script>"; ?>

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    var ua = navigator.userAgent;
    
    //Browserweichen
    
    if (ua.indexOf('Navigator') > -1 ){
       // Der Code
    }
    else if (ua.indexOf('Firefox') > -1){
         // Der Code
    } 
    else if (ua.indexOf('MSIE') > -1) {
        // Der Code
    }
    else if (ua.indexOf('Opera') > -1) {
        // Der Code
    }
    else if (ua.indexOf('Chrome') > -1) {
         // Der Code
    }
    else if (ua.indexOf('Safari') > -1){
        // Der Code
    }
    
    document.write(ua);