what you can do if you firm to use it in div make an ajax call for that aspx page in header and on success of ajax put content of that aspx page using after the div uisng jquery
function LoadPage(){
$.get('http://a_site.com/yourpage.aspx', function(data) {
$('#YourDivId').html(data);
});
}
then call this Loadpage On your click event of a button or on Onload event of page body.