Please, help the beginner with navigation

Question

Hello to everyone!
I have found similar questions from other users, but they were not answered. May be, the question is very stupid? However, there's nobody else who I can ask.
So, user Wojo had almost the same trouble:
"I have a hyperlink that has an action attached, say hyperlink_action. I have set target="_blank" for this hyperlink because I want the page to be pulled up in a different window. When I click on the hyperlink, the event handler (hyperlink_action) is called and the navigation.xml tells the right page to display in a new window! Everything is good so far. However, when I go back to the parent window and click on any other button or link (ANY ONE), then the hyperlink_action handler is called first followed by the event handler for the button or link I clicked on. This only happens the first time I click on the parent page again. ..."
Please, explain why "hyperlink_action()" is executed twice?
Thanks.

Answer 1

So, the problem's been solved. It's required to modify the current theme.
(in "formElements.js" file)
We remove the form attribute "target" from initial form, if it isn't null, and hidden fields, created before.
function hyperlink_submit(hyperlink, formId, params) {
//params are name value pairs but all one big string array
//so params[0] and params[1] form the name and value of the first param
var theForm = document.getElementById(formId);
if (params != null) {
for (var i=0; i<params.length; i++) {
common_insertHiddenField(params, params[i+1], theForm);
i++;
common_insertHiddenField(hyperlink.id + "_submittedField", hyperlink.id, theForm);
var formTargetOrig = theForm.target;
if (hyperlink.target != null) {
theForm.target = hyperlink.target;
theForm.submit();
theForm.target = formTargetOrig;
if (hyperlink.target != null && hyperlink.target == "_blank") {
if (params != null) {
for(var i=0; i<params.length; i+=2) {
var childElem = document.getElementById(params[i]);
theForm.removeChild(childElem);
var childElem = document.getElementById(hyperlink.id + "_submittedField");
theForm.removeChild(childElem);
return false;