Execute function before refresh
window.onbeforeunload = function(event) { return confirm("Confirm refresh"); };
$(window).bind('beforeunload', function(){ return '>>>>>Before You Go<<<<<<<< \n Your custom message go here';});Source: http://www.mkyong.com/jquery/how-to-stop-a-page-from-exit-or-unload-with-jquery/
Demo: http://www.mkyong.com/wp-content/uploads/jQuery/jQuery-stop-page-from-exit.html
$(window).bind("beforeunload", function(){ return confirm("Do you really want to refresh?"); });