how to make new line in js var array value : i have code like this, i just want to make my marker info hava a new line in info window, something like

      first line 
      second line
      etc

 
but with variable like this, how to i can make new line with my code like this,

  

     function addMarker(marker) {
          var category = marker[2];
          var title = marker[9];
          var pos = new google.maps.LatLng(marker[10], marker[11]);
          var content = marker[3] +  marker[9] + marker[8];
          var session = marker[6];
          var myIcon='http://ruralshores.com/assets/marker-icon.png'; 
          marker1 = new google.maps.Marker({
              title: title,
              position: pos,
              category: category,
              session: session,
              map: map,
              icon: myIcon 
          });

how i can make new line on my code?

    var content = marker[3] +  marker[9] + marker[8];

thanks in advanced

kraken
