problem in writing aspx code in aspx.cs

i have to write aspx code in aspx.cs (code behind code)

aspx code
<script type="text/javascript">
function open_win() {
var win = window.open('home.aspx')
win.document.write('<img src= "./Images/indicator.gif">'+'Loading....');
win.document.close();
win.document.location = home.aspx';

}
</script>
</head>

please advise on same.
thank you in advance