function formValidate(f) {

if (f.email.value.length < 1) {
	alert("Please enter your email address.");  
	f.email.focus(); 
	return false;
	
} 

else if (f.grade.options[f.grade.selectedIndex].value == "none") {
	alert("Please enter the grade taught.");  
	f.grade.focus(); 
	return false;
	
} 

else if ((f.teachers.checked == false ) &&
	(f.preschool_book_nook.checked == false ) &&
	(f.librarians.checked == false ) &&
	(f.junieclub.checked == false ) &&
	(f.treehouseclub.checked == false ) &&
	(f.natethegreatclub.checked == false ) &&
	(f.andrewlost.checked == false )) {
	alert("Please select at least one newsletter.");  
	return false;
}
	
else {
	return true;
}

}