function chkFormular () {
	if(document.getElementById) {
		  if (document.getElementById('newsletter').Mail.value == "" || document.getElementById('newsletter').Mail.value.indexOf("@") == -1 || document.getElementById('newsletter').Mail.value.lastIndexOf(".") < document.getElementById('newsletter').Mail.value.length -4) {
			alert("check doch mal deine eMail-Adresse!");
			document.getElementById('newsletter').Mail.focus();
			return false;
		  }
		}
	}