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$(selector).load(URL,data,callback);

<h2>jQuery AJAX is an awesome feature!</h2>
<p id="p1">This is some text in a paragraph.</p>

$("#div1").load("demo_test.txt");

$("#div1").load("demo_test.txt #p1");

$("button").click(function(){
  $("#div1").load("demo_test.txt",function(responseTxt,statusTxt,xhr){
    if(statusTxt=="success")
      alert("External content loaded successfully!");
    if(statusTxt=="error")
      alert("Error: "+xhr.status+": "+xhr.statusText);
  });
});