function form_check(f) {

	check_flug = false;
	if (f.price.length == undefined){
		f.price.checked = true;
		return true;
	}
	for (i=0;i<f.price.length;i++){
		if(f.price[i].checked == true){
			check_flug = true;
		}
	}
	if (check_flug == true){
		return true;
	}else{
		alert("Select Product Format");
		return false;
	}
}