function displayOverlay(id) {
    obj = document.getElementById(id);
    obj.style.visibility = 'visible';
    obj.style.display='block';
    obj.style.position = 'absolute';
    if(navigator.appName == 'Microsoft Internet Explorer') {
    	obj.style.left = window.event.x  + 'px';
        obj.style.top = window.event.y + 'px';
    } else {
    	obj.style.right = '10px';
        obj.style.top = '10px';
    }
    
 /*
    else if(navigator.appName == 'Netscape' && event.pageX != null) {
    	obj.style.left = event.pageX  + 'px';
        obj.style.top = event.pageY + 'px';
    }
    else {
    	obj.style.position = 'relative';
    	obj.style.left = '5px';
        obj.style.top = '5px';
    } 
 */
}
function hideOverlay(id) {
    obj = document.getElementById(id);
    obj.style.visibility = 'hidden';
    obj.style.display='none';
}