$(document).ready(function($) {
  $("#donationType").change(function() { slideForm($("#donationType").val()) });
});

function slideForm(formVal) {
    if (formVal == 'Corporate Gift') {
		$('#donorName').slideUp();
		$('#companyName').slideDown();
		$('#mailingAddr').slideDown();
	} else if (formVal == ''){
		$('#donorName').slideUp();
		$('#companyName').slideUp();
		$('#mailingAddr').slideUp();
    } else {
        $('#donorName').slideDown();
        $('#companyName').slideUp();
        $('#mailingAddr').slideDown();
    }
}