function check_order()
{
	var str = '';
	var error_fields = new Array();

	if(document.getElementById('domain_name').value.length==0) {
		str += "Zadejte název domény.\n";
		error_fields.push('domain_name');
	}
	if(document.getElementById('hosting_type').selectedIndex==0) {
		str += "Vyberte hostingový program.\n";
		error_fields.push('hosting_type');
	}
	if(document.getElementById('person_type').selectedIndex==0) {
		str += "Vyberte subjekt.\n";
		error_fields.push('person_type');
	}
	if(error_fields.length) {
		alert(str);
		focus_element(error_fields[0]);
		return false;
	} else {
		return true;
	}
}