Untitled

<body onpagerefresh="updateContents()">

var divElement = document.getElementById('mydiv');
divElement.onpagerefresh = new Function("èvent", "alert();");

var event = new Event('onpagerefresh');

// Listen for the event.
elem.addEventListener('onpagerefresh', function (e) {
    updateContents();
}, false);

// Dispatch the event.
elem.dispatchEvent(event);