--- /dev/null
+jQuery(function() {
+ // reset form submit info when user goes backward or forward for Safari
+ // other browsers don't need this trick and they can work directly.
+ if ( window.addEventListener ) {
+ window.addEventListener("popstate", function(e) {
+ jQuery('form').data('submitted', false);
+ });
+ }
+
+ jQuery('form').submit(function(e) {
+ var form = jQuery(this);
+ if (form.data('submitted') === true) {
+ e.preventDefault();
+ } else {
+ form.data('submitted', true);
+ }
+ });
+});