Prevent page reloading on dialog close

Prevent page reloading on dialog close

When I close the dialog box, the page is reloaded. How can I prevent it.
function getDialog(url){
$.mobile.showPageLoadingMsg();
$.ajax({
url:url,
success: function(result) {
$('#content').html(result);
$.mobile.changePage('#dialog', 'pop', true, true);
}
});
}