function showLightbox(){
	document.getElementById("overlay").style.display = 'block';
	document.getElementById("ov_center").style.visibility = "visible";
	if ( isMacFire() ) document.getElementById("ov_center").style.display = "block";
	
	 arr = document.getElementsByTagName('select');
	 for(i = 0; i < arr.length; i++) {
		 arr[i].style.visibility = 'hidden';
	 }

	return false;
}

function hideLightbox(){
	document.getElementById("overlay").style.display = 'none';
	document.getElementById("ov_center").style.visibility = 'hidden';
	if ( isMacFire() ) document.getElementById("ov_center").style.display = "none";

	arr = document.getElementsByTagName('select');
	for(i = 0; i < arr.length; i++) {
		arr[i].style.visibility = 'visible';
	}

	return false;
}

function goto_join_page(content_id) {
	showLightbox();
	return void(0);
}

function initLightBox() {
        if ( isMacFire() && document.getElementById("ov_center") ) {
                document.getElementById("ov_center").style.display = "none";
        }
}

function isMacFire() {
        var browser_name = navigator.userAgent;
        return ( browser_name.lastIndexOf('Macintosh') != -1 && browser_name.lastIndexOf('Firefox') != -1 );
}