// The client event MouseOver takes two parameters sender and e
// sender is the object which is raising the event
// e is the TabMouseEventArgs
function WebTab1_MouseOver(sender, e) {
var tab =sender;
//Gets the index of the tab involved in the MouseOver event
var tabIndex = e.get_tabIndex();
//Gets index of scroll button involved in mouse event.
//Possible values: 0 - right or top scroll button, 1 - left or bottom scroll button,
// -1 - it is event over tab item or add-new-tab button
var scrollButtonIndex = e.get_scrollButtonIndex();
//Assuming you have a label called labelOutput on the form
var label = $get('labelOutput');
if (e.isAddNewTabButton()) {
label.innerHTML = "Mouse over add new tab button";
}
else if (e.isCloseButton()) {
label.innerHTML = "Mouse over close button with tab index" + tabIndex;
}
else
if (tabIndex != -1) {
label.innerHTML = "Mouse over the tab with index '" + tabIndex + "'";
}
else {
if (scrollButtonIndex == 0) {
label.innerHTML = "Mouse over the right scroll button";
}
else
label.innerHTML = "Mouse over the left scroll button";
}
}