function showSubNav (id) {
	subnavs = document.getElementById('subnav').children;
	
	for (var i = 0; i < subnavs.length; i++) {
		subnavs[i].setAttribute('class', 'hidden');
	}
	
	selected_nav = document.getElementById(id);
	if (selected_nav) {
		selected_nav.setAttribute('class', '');
	}
}

function swapImage(image) {
	var img = document.getElementById('bio_pic');
	
	var firstChild = img.children.item(0);
	if (firstChild.tagName != "IMG") {
		img.removeChild(firstChild);
	
		var new_img = document.createElement('img');
		new_img.setAttribute('src', image);
		new_img.setAttribute('width', '500');
		img.appendChild(new_img);
	} else {
		firstChild.setAttribute('src', image);
	//img.firstElementChild.setAttribute('src', image);
	}
	
	
}

function swapVideo(video) {
	var img = document.getElementById('bio_pic');
	var firstChild = img.children.item(0);
	
	img.removeChild(firstChild);
	//var video_node = document.createElement('<div style="width:600; height:200;background-color:blue;">www.java2s.com</div>');
	//var iframe = '<iframe class="youtube-player" type="text/html" width="500" height="400" src="' + video + '" frameborder="0"></iframe>';
	var iframe = document.createElement('iframe');
	iframe.setAttribute('src', video);
	iframe.setAttribute('width', '500');
	iframe.setAttribute('height', '400');
	
	//var video_node = document.createElement(iframe);
	img.appendChild(iframe);
	//<iframe class="youtube-player" type="text/html" width="640" height="385" src="http://www.youtube.com/embed/VIDEO_ID" frameborder="0">
//</iframe>
}

function get_form_validation(formName) {
	if (formName == 'application') {
		return [
			'dog_name',
			{ dropdown: 'read_bio', index: 1, error: 'Please read the whole bio before continuing' },
			'applicant_name',
			'address',
			{ fields: ['city', 'state', 'zip'], required: 'all', error: 'City, State & Zip are required' },
			{ fields: ['home_phone', 'cell_phone', 'work_phone'], error: 'Enter at least one phone number' },
			'email_address',
			{ dropdown: 'head_of_household', index: 1, error: 'Only the head of household can submit' },
			{ fields: ['pets_breed_0', 'pets_breed_1', 'pets_breed_2', 'pets_breed_3', 'pets_breed_4', 'pet_history' ],
			error: 'Animal experience history is required', errorField: 'pet_history' },
			'num_adults', 'adult_ages', 'family_relationship',
			'num_children', 'children_ages',
			{ dropdown: 'all_agreed', index: 1, error: 'Sumbit only when everyone is ready' },
			{ dropdown: 'planned_vacation', error: 'Select YES or NO' },
			{ dropdown: 'adopt_immediately', error: 'Select YES or NO' },
			{ dropdown: 'available_next_adoption', error: 'Select an answer' },
			{ dropdown: 'home_during_day', error: 'Select YES or NO'},
			'hours_alone',
			{ dropdown: 'home_pet_will_be', error: 'Select an answer'},
			{ dropdown: 'not_home_pet_will_be', error: 'Select an answer'},
			'pet_sleep',
			{ dropdown: 'type_home', error: 'Select an answer'},
			{ dropdown: 'own_or_rent', error: 'Select an answer'},
			'moving',
			{ dropdown: 'fenced_yard', error: 'Select an answer'},
			{ dropdown: 'fence_type', error: 'Select an answer'},
			'fence_height',
			{ dropdown: 'pool', error: 'Select an answer'},
			'where_obedience', 'where_been_obedience',
			'vet_info',
			{ dropdown: 'willing_to_housebreak', error: 'Select YES or NO'},
			{ dropdown: 'unwilling_to_homecheck', error: 'Select YES or NO'},
			'chewing', 'digging', 'barking', 'housebreaking',
			'why_this_dog',
			{ dropdown: 'given_up_pet', error: 'Select YES or NO'},
			'sick_pet'
		];
	} else if (formName == 'contact') {
		return [
			'name', 'phone', 'email',
			{ dropdown: 'subject', error: 'Please select a subject' },
			'comment',
			'captcha'
		];
	} else if (formName == 'rehome') {
		return [
			'applicant_name', 'address',
			{ fields: ['city', 'state', 'zip'], required: 'all', error: 'City, State & Zip are required' },
			{ fields: ['home_phone', 'cell_phone', 'work_phone'], error: 'Enter at least one phone number' },
			'email_address',
			'dog_name', 'yours_or_found', 'how_long_had_dog', 'breed', 'purebred', 'age', 'sex', 'colors', 'coat_length', 'weight',
			'housebroken', 'crate_trained', 'inside_outside', 'get_along_dogs', 'get_along_cats', 'young_children', 'older_children',
			'leash', 'left_alone', 'hours_alone', 'barker', 'digger', 'afraid', 'car', 'training',
			'bit_animal', 'bit_person',
			'dog_origin',
			'altered', 'microchipped', 'up_to_date', 'fecal_test', 'heartworm', 'flea_prevention',
			'vet_info', 'vet_visit', 'paperwork', 'medications', 'health',
			'donation', 'how_long_stay'
		];
	} else if (formName == 'volunteer') {
		return [ 'email' ];
	}
}


function validate_form(formName) {
	var form = document.forms[formName];

	var required_fields = get_form_validation(formName);
	
	firstError = null;
	validForm = true;
	
	for (var i = 0; i < required_fields.length; i++) {
		var field = required_fields[i];
		if (field.fields) {
			var filled = 0;
			var fields = field.fields;
			var siblings = [];
			for (var j = 0; j < fields.length; j++) {
				siblings[j] = form[fields[j]];
				if (form[fields[j]].value) {
					filled++;
				}
			}
			if (filled <= 0 || (field.required && filled < fields.length)) {
				for (j = 0; j < fields.length; j++) {
					var error = '';
					var errorField = field.errorField || fields[0];
					if (fields[j] == errorField) {
						error = field.error;
					}
					if (!form[fields[j]].value) {
						writeError(form[fields[j]], error, 'error_group', 'error_msg_group', siblings);
					}
				}
			}
		} else if (field.dropdown) {
			if (field.index && form[field.dropdown].selectedIndex != field.index) {
				writeError(form[field.dropdown], field.error);
			} else if (!field.index && form[field.dropdown].selectedIndex <= 0) {
				writeError(form[field.dropdown], field.error);
			}
		} else {
			if(!form[field].value) {
				writeError(form[field], 'This field is required');
			}
		}
	}

	if (firstError) {
		firstError.focus();
	}		

	if (validForm) {
		return true;
	} else {
		return false;
	}
	
	
	
	return false;
  }

function writeError(obj, message, errorClass, msgClass, siblings) {
	validForm = false;
	if (obj.hasError) {
		if (!firstError) {
			firstError = obj;
		}
		return;
	}

	obj.className = errorClass || 'error';
	obj.onchange = function() { removeError(obj, siblings) };
	var sp = document.createElement('span');
	sp.className = msgClass || 'error_msg';
	sp.appendChild(document.createTextNode(' ' + message));
	obj.parentNode.appendChild(sp);
	obj.hasError = sp;

	if (!firstError) {
		firstError = obj;
	}

}

function removeError(obj, siblings)
{
	if (!obj.hasError) {
		return;
	}
	
	obj.className = obj.className.substring(0,obj.className.lastIndexOf(' '));
	obj.parentNode.removeChild(obj.hasError);
	obj.hasError = null;
	obj.onchange = null;
	
	if (siblings) {
		for (var i = 0; i < siblings.length; i++) {
			removeError(siblings[i]);
		}
	}
}