Uncaught ReferenceError: myFunction is not defined

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You cannot place myFunction after the onclick. When the onclick is seen there is no definition for myFunction.

Place the JavaScript in <head> tag. Also, move the function outside of ready().

Like this:

<script type="text/javascript">
var nexturl ="";
var lastid ="";
var param;

function myFunction() {
    param = $('#search').val();
    alert("I am an alert box!");
    if (param != "") {
        $("#status").show();
        var u = 'https://graph.facebook.com/search/?callback=&limit=100&q='+param;
        getResults(u);
        }
}

$(document).ready(function() {

  $("#more").click(function () { 

    $("#status").show();
    $("#more").hide();  
    pageTracker._trackPageview('/?q=/more');
    var u = nexturl;
    getResults(u);
  });

});
</script>
</head>
<body>
...

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