function dynamic(id)
{
	if(id==1) {
				document.getElementById('pack').style.display = "none";
				document.getElementById('main_table').style.display = "block";
	};
	if(id==2) {
				document.getElementById('main_table').style.display = "none";
				document.getElementById('pack').style.display = "block";
	};
	return false;
}