Ghetto Javascript Custom Error Checking

function donationCheck() {
	errors = "";
	// the nasty error string
	if (document.bottomForm.donationFinal.value == "None") {
		errors+= "Donation Amount\n";
	}
	if (document.bottomForm.donationFirstName.value == "") {
		errors+= "Fist Name\n";
	}
	if (document.bottomForm.donationLastName.value == "") {
		errors+= "Last Name\n";
	}
	if (document.bottomForm.donationPhone.value == "") {
		errors+= "Phone Number\n";
	}
	if (document.bottomForm.donationEmail.value == "") {
		errors+= "Email\n";
	}
 
	if(document.bottomForm.donationFinal.value == "Other" && document.bottomForm.otherDonation.value == "OTHER") {
		errors+= "Other Donation Amount\n";
	}
 
	if (errors == "") {
		submitDonation();
	} else {
		alert("Please fill in the following fields:\n" + errors);
	}	
}