function doblankchecks(){
	with (document.bbform) {
		if (name.value == ""){
		alert("Please enter your name.");
		name.focus();
		return false;
	}
			if (tel.value == ""){
		alert("Please enter your telephone number.");
		tel.focus();
		return false;
	    }
			if (email.value == ""){
		alert("Please enter your email address.");
		email.focus();
		return false;
	    }
			if (bb4d.value == ""){
		alert("Please enter the best before date.");
		bb4d.focus();
		return false;
	    }
			if (manufacturing.value == ""){
		alert("Please enter the manufacturing time.");
		manufacturing.focus();
		return false;
	    }
	}
}