function checkit(form) {
	if (form.colour.value == "") {
		alert("Please select a colour.");
		form.colour.focus();
		return false;
	}
	if (form.size.value == "") {
		alert("Please select a size.");
		form.size.focus();
		return false;
	}
	if (form.quantity.value == "") {
		alert("Please select a quantity.");
		form.quantity.focus();
		return false ;
	}
	return true;
}