tabs.aria.7

$tab = $('<li/>').attr({
    'id': id + '_tab' + i//, // create unique id for a tab
    'role': 'tab', // assign tab role
    'aria-controls': id + '_panel' + i // define which panel it controls
})
.text(lbl > '' ? lbl : 'Tab ' + (i + 1))
.on('keydown', {'plugin': plugin, 'index': i}, plugin.onKeyDown) // add keyboard event handler
.on('click', {'plugin': plugin, 'index': i}, plugin.selectTab) // add mouse event handler
.appendTo($tabbar);