function check()
{
	if (window.document.Offert.Name.value == "" || window.document.Offert.Strasze.value == "" || window.document.Offert.Plz_Ort.value == "" || window.document.Offert.TelNr.value == "" || window.document.Offert.EMail.value == "")
	{
		if (window.document.Offert.Name.value == "") {window.document.Offert.Name.style.backgroundColor = "#FF0000";} else {window.document.Offert.Name.style.backgroundColor = "#FFFFFF";}
		if (window.document.Offert.Strasze.value == "") {window.document.Offert.Strasze.style.backgroundColor = "#FF0000";} else {window.document.Offert.Strasze.style.backgroundColor = "#FFFFFF";}
		if (window.document.Offert.Plz_Ort.value == "") {window.document.Offert.Plz_Ort.style.backgroundColor = "#FF0000";} else {window.document.Offert.Plz_Ort.style.backgroundColor = "#FFFFFF";}
		if (window.document.Offert.TelNr.value == "") {window.document.Offert.TelNr.style.backgroundColor = "#FF0000";} else {window.document.Offert.TelNr.style.backgroundColor = "#FFFFFF";}
		if (window.document.Offert.EMail.value == "") {window.document.Offert.EMail.style.backgroundColor = "#FF0000";} else {window.document.Offert.EMail.style.backgroundColor = "#FFFFFF";}
		alert ("Bitte ergänzen Sie die rot markierten Felder!");
		return false;
	}
	return true;
}

function del()
{
	window.document.Offert.Name.style.backgroundColor = "#FFFFFF";
	window.document.Offert.Strasze.style.backgroundColor = "#FFFFFF";
	window.document.Offert.Plz_Ort.style.backgroundColor = "#FFFFFF";
	window.document.Offert.TelNr.style.backgroundColor = "#FFFFFF";
	window.document.Offert.EMail.style.backgroundColor = "#FFFFFF";
}