index.htm
<html>
<head>
<title>Insert title here</title>
</head>
<body>
<iframe src="1.htm"></iframe>
<iframe id="main" src=""></iframe>
</body>
</html>
1.htm
<html>
<head>
</head>
<body>
<script>
function load_1()
{
parent.document.getElementById('main').onload=function()
{
this.contentWindow.document.images[0].src="123.gif";
}
parent.document.getElementById('main').src="123.htm";
}
</script>
<body>
<a href="#" onclick="load_1();return false;">wqe</a>
</body>
</html>
123.htm
<html>
<head>
<title>title</title>
<script type="text/javascript">
</script>
</head>
<body>
<img src="" />
</body>
</html>