function check_form() {
	
	if (document.getElementById('shop_resume_email').value !== document.getElementById('shop_resume_email_check').value)
	{
		alert ('Deine E-Mail-Adressen sind nicht identisch!');
		return false;
	}
	
	  document.getElementById('shop_resume_plz').style.borderColor = '#BCBCBC';
	  document.getElementById('shop_resume_nickname').style.borderColor = '#BCBCBC';
	  document.getElementById('shop_resume_street').style.borderColor = '#BCBCBC';
	  document.getElementById('shop_resume_city').style.borderColor = '#BCBCBC';
	  document.getElementById('shop_resume_plz').style.borderColor = '#BCBCBC';
	  document.getElementById('shop_resume_email').style.borderColor = '#BCBCBC';
	  document.getElementById('shop_resume_email_check').style.borderColor = '#BCBCBC';

	if ((document.getElementById('shop_resume_plz').value.length !== 5) || (document.getElementById('shop_resume_nickname').value == '') || (document.getElementById('shop_resume_street').value  == '') || (document.getElementById('shop_resume_city').value  == '')) {
	  document.getElementById('shop_resume_plz').style.borderColor = 'red';
	  document.getElementById('shop_resume_nickname').style.borderColor = 'red';
	  document.getElementById('shop_resume_street').style.borderColor = 'red';
	  document.getElementById('shop_resume_city').style.borderColor = 'red';
	  document.getElementById('shop_resume_plz').style.borderColor = 'red';
	  alert('Deine PLZ muss exakt 5 Zeichen umfassen. Ausserdem müssen folgende Felder ausgefüllt sein: \n\n* Nachname\n* Straße\n* Stadt\n');
	} 
	else if ((document.getElementById('shop_resume_email').value.length < 1)) {
		document.getElementById('shop_resume_email').style.borderColor = 'red';
		alert('Bitte fülle die E-Mail-Adresse aus!');
	} else if ((document.getElementById('shop_resume_email_check').value.length < 1)) {
		document.getElementById('shop_resume_email_check').style.borderColor = 'red';
		alert('Bitte fülle die Wiederholungs-E-Mail-Adresse aus!');
	} else if ((document.getElementById('shop_resume_email').value.search(/\@.+/) == -1) || (document.getElementById('shop_resume_email_check').value.search(/\@.+/) == -1)) {
		document.getElementById('shop_resume_email').style.borderColor = 'red';
		document.getElementById('shop_resume_email_check').style.borderColor = 'red';
		alert('Die E-Mail-Adresse ist ungültig.');
	} else {
	  document.shop_resume.submit();
	}
	
}