function openWindow(url, name, w, h)	{
	var winX = 0;
	var winY = 0;

	if (parseInt(navigator.appVersion) >= 4)	{
	winX = (screen.availWidth - w)*0.5;
	winY = (screen.availHeight - h)*0.5;
}
	var features = 'width=' + w + ',height=' + h + ',left=' + winX + ',top=' + winY ;

productwin = window.open(url, name, features);
}