function fixElement(element, message) 
{
alert(message);
element.focus();
}

function validateField(form) {
	
	var form = document.forms['captureForm'];

	if (form.firstname.value == "") {
		fixElement(form.firstname, "Please include your first name.");
		return false;
	}
	else if (form.surname.value =="") {
		fixElement(form.surname, "Please include surname.");
		return false;
	}
	else if (form.telephone.value =="") {
		fixElement(form.telephone, "Please include your telephone number.");
		return false;
	}

	var checkboxFlag = 0
		
		if (form.morning.checked){checkboxFlag = 1;}
		if (form.afternoon.checked){checkboxFlag = 1;}
		if (form.evening.checked){checkboxFlag = 1;}
		if (form.saturday.checked){checkboxFlag = 1;}
		
		if (checkboxFlag == 0){
			alert("Please select at least one time to contact you");
	    		return false;
	}
}