[cyber]

Brook, http://jsfiddle.net/SdZ2W/

(function () {
    var text = $("#text"),
        i = 0,
        str = "",
        content = ["first", "<br>second", "<br>three"];
     
     
     $("#add-text").on("click", function () {
         
         if(i == content.length)
             return;
         
         text.html(str += content[i++]);
              
     });
      
      
 }())