function sessStorage( key, value ) {
    var currentValue = sessionStorage.getItem( key );
    if ( typeof value !== "undefined" && currentValue !== value ) {
        sessionStorage.setItem( key, value );
        if ( !( window.eval && eval("/*@cc_on 1;@*/") ) ) {
            var e = document.createEvent( 'StorageEvent' );
            e.initStorageEvent( 'storage', false, false, key,
                currentValue, value, location.href, window.sessionStorage );
            window.dispatchEvent( e );
        }
        currentValue = value;
    }
    return currentValue;
}

if ( "addEventListener" in window ) {
    window.addEventListener('storage', storageEventHandler, false);
} else {
    document.attachEvent('onstorage', storageEventHandler );
}
 
function storageEventHandler(e){
    alert("storage event called key: " + e.key );
}

sessStorage("name1", "holi122");