function adjust()  {
if((navigator.appName.indexOf('Netscape') != -1)&& (parseInt(navigator.appVersion) ==4)) {
	alert('sorry, no pretty layouts for netscape 4');
}
else {
	if (document.getElementById) {
		var Parent = document.getElementById('main');
		var Child = document.getElementById('center');
		var h = Child.offsetHeight + 500;
		Parent.style.height = h + 'px';
		return true;
	}
}
}