function check_zuklein(text) {
  return (text.length > 5); // gibt false zurück wenn leer
}
function check_empty(text) {
  return (text.length > 0); // gibt false zurück wenn leer
}

function check_email(address) {
  if ((address == "")
    || (address.indexOf ('@') == -1)
    || (address.indexOf ('.') == -1))
      return false;
  return true;
}
function checkform() {
if (!check_email(document.form1.mailemail.value))
   { var vali1 = false;form1.mailemail.className='alertform';}else {var vali1 = true;form1.mailemail.className='eingabetext';}
if (document.form1.mailvorname.value=="")
	{ var vali2 = false;form1.mailvorname.className='alertform';}else {var vali2 = true;form1.mailvorname.className='eingabetext';} 
if (document.form1.mailnachname.value=="")
	{ var vali3 = false;form1.mailnachname.className='alertform';}else {var vali3 = true;form1.mailnachname.className='eingabetext';} 
if (document.form1.mailtel.value=="")
	{ var vali4 = false;form1.mailtel.className='alertform';} else {var vali4 = true;form1.mailtel.className='eingabetext';}
if (document.form1.mailplz_ort.value=="")
	{ var vali5 = false;form1.mailplz_ort.className='alertform';} else {var vali5 = true;form1.mailplz_ort.className='eingabetext';}
if (document.form1.mailstr_num.value=="")
	{ var vali6 = false;form1.mailstr_num.className='alertform';} else {var vali6 = true;form1.mailstr_num.className='eingabetext';}
if (vali1==true&&vali2==true&&vali3==true&&vali4==true&&vali5==true&&vali6==true) {
document.form1.submit();
}

}


function checkformnesletter() {
if (!check_email(document.form1.email.value) ||!check_email(document.form1.email2.value)|| document.form1.email.value!=document.form1.email2.value)
	{var vali1 = false;form1.email.className='alertform';form1.email2.className='alertform';}else {var vali1 = true;form1.email.className='eingabetext';form1.email2.className='eingabetext';}
if (document.form1.name.value=="")
	{var vali2 = false;form1.name.className='alertform';}else {var vali2 = true;form1.name.className='eingabetext';} 
if (document.form1.plz.value=="")
	{var vali3 = false;form1.plz.className='alertform';}else {var vali3 = true;form1.plz.className='eingabetext';} 
if (document.form1.stadt.value=="")
	{var vali4 = false;form1.stadt.className='alertform';} else {var vali4 = true;form1.stadt.className='eingabetext';}
if (vali1==true&&vali2==true&&vali3==true&&vali4==true) {
document.form1.submit();
}

}