What I want is to show the visitor a sign, saying that if you want to add a bookmark on your homepage.
Something like this:
I thought that with the window.sidebar.addPanel(url,title,'') function I could achieve it but I only get an alert saying, that with prestring CTRL + D something like that I could add a marker, but what I want to achieve is that a dialogue is left below to navigate like this as in the image.