I can not run JavaScript file in ajax Call

Hi Dears.

my code is like this :

Html Code :

<html>

<head>

<script src="jquery.js"></script>

<script>

function showHint(str)

{

if (str.length==0)

{

document.getElementById("usa").innerHTML="";

return;

}

var xmlhttp=new XMLHttpRequest();

xmlhttp.onreadystatechange=function()

{

if (xmlhttp.readyState==4 && xmlhttp.status==200)

{

document.getElementById("usa").innerHTML=xmlhttp.responseText;

}

}

xmlhttp.open("GET","a.php" ,true);

xmlhttp.send();

}

</script>

</head>

<body>

<div id="usa">

<img src="image/d2.jpg" onmouseover="omid(this)" />

</div>

</body>

</html>

and PHP code is :

<html>

<head>

<script src="jquery.js"></script>

</head>

<body>

<?php

echo "<h1 id='usa'>Salam Omid php</h1>";

echo '<script>

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

$.getScript("alert.js");

});

</script>';

?>

</body>

</html>

JS file:

alert ("hello");

when I run a.php the alert.js will run but when I call a.php using ajax، the javascript file in php file will not run.

how can i run java script file that are in another files ?

thanks.

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