Safari 5 Extension: How can I detect when a window's current tab has changed?

Question

I have a Safari 5 extension that contains a toolbar. Whenever the current tab changes, that toolbar should be updated. I would like to do something like this from my bar\'s

Answer 1

This code will help to trace the change in URL :- Write this code Inject.js , in side function

function trackURL() {

    alert("beforeNavigate "+safari.application.activeBrowserWindow.activeTab.url);
        setTimeout(function() {
            alert("afterNavigate "+safari.application.activeBrowserWindow.activeTab.url);

            }, 500);
    }
    safari.application.addEventListener("beforeNavigate", trackURL, true);