Question

Why cant I work out with this function in my js:
error: ReferenceError: new_tweet is not defined

  function new_tweet(){
         alert("here i am");
  }

  function add_div(){
    mydiv = document.getElementById("new_twt");
    mydiv.innerHTML="<input type='button' value='You have new conversations' onclick=new_tweet();>";
  }

Answer 1

The problem is probably that you are doing this in some kind of load handler, which means that new_tweet is not global and therefore not available when you click the button. Try defining new_tweet in a global scope.

Here is a demonstration: http://jsfiddle.net/DUbc3/