function Testeingabe(theForm)
{
I = 0;
String ='';

if (theForm.Name.value=='') 
  { theForm.Name.style.backgroundColor= '#eae5e1';I = 1;}

if (theForm.Email.value=='') 
  { theForm.Email.style.backgroundColor= '#eae5e1';I = 1;}

if (theForm.Nachricht.value=='') 
  { theForm.Nachricht.style.backgroundColor= '#eae5e1';I = 1;}

if (I == 1)
{
 alert('Bitte fülle alle farblich markierten Felder aus!'+String);  
    return (false);
  }

if (I == 0)
{
  return (true);
}
}