// JavaScript Document
function check_letter() {
	obj = document.forms.letter_form;
	if ((obj.mail.value === '')) {
		var mail = window.prompt('Bitte eine E-Mail Adresse eingeben:', '');
		obj.mail.value = mail;
	}else{
		var true_mail = obj.mail.value.search(/@.+/);
		if(true_mail !== -1){
			document.forms.letter_form.submit();	
		}else{
			var mail = window.prompt('Bitte eine korrekte E-Mail Adresse eingeben:', '');
			obj.mail.value = mail;	
		}
	}
}

function check_contact() {
	obj = document.forms.contact_form;
	
	if(obj.name.value === '' || obj.mail.value === '' || obj.mess.value === ''){
		if(obj.name.value === ''){
			document.getElementById('error_name').innerHTML = '← Bitte ausfüllen!';
		}else{
			document.getElementById('error_name').innerHTML = '';
		}
		
		if(obj.mail.value === ''){
			document.getElementById('error_mail').innerHTML = '← Bitte ausfüllen!';
		}else{
			document.getElementById('error_mail').innerHTML = '';
		}
		
		if(obj.mess.value === ''){
			document.getElementById('error_mess').innerHTML = '← Bitte ausfüllen!';
		}else{
			document.getElementById('error_mess').innerHTML = '';
		}
	}else{
		var true_mail = obj.mail.value.search(/@.+/);
		if(true_mail !== -1){
			document.forms.contact_form.submit();	
		}else{
			document.getElementById('error_mail').innerHTML = '← Bitte eine korrekte E-Mail Adresse eingeben!';
		}
	}
}