Codice PHP:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd"
>
<
html>
<
head>
<
title>Untitled Document</title>
<
meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<
script language="JavaScript" type="text/JavaScript">
function 
getImgtarget )
{
    var 
myimg document.createElement("img");
    
myimg.setAttribute("src""11.gif");
    
document.getElementByIdtarget ).appendChild(myimg);
}
window.onload = function()
{
    
getImg("target");
}
</script>

</head>

<body>
<div id="target"></div>
</body>
</html> 
Al posto di 11.gif metti un'img che hai nella stessa directory
e funziona come deve.