function checkFields(form){

	if (form.firstname.value == ""){
		alert("Please enter your first name.");
		form.firstname.focus();
		return false;
	}
	
	if (form.lastname.value == ""){
		alert("Please enter your last name.");
		form.lastname.focus();
		return false;
	}
	
	if (form.city.value == ""){
		alert("Please enter your city.");
		form.city.focus();
		return false;
	}	
	
	if (form.email.value.indexOf('@') < 2){
		alert("Please enter a valid email address.");
		form.email.focus();
		return false;
	}
	
	if (form.heard.selectedIndex == 0){
		alert("Please indicate how your heard about us.");
		form.heard.focus();
		return false;
	}
	
	if (form.location.selectedIndex == 0){
		alert("Please choose the location of your school.");
		form.location.focus();
		return false;
	}
	
	return true;
}