function chkContaktForm()
{
 if(document.contactForm.name.value == "")  {
   alert("Please enter your name!");
   document.contactForm.name.focus();
   return false;
  }
 if(document.contactForm.email.value == "") {
   alert("Please enter your E-Mail-Address!");
   document.contactForm.email.focus();
   return false;
  }
 if(document.contactForm.email.value.indexOf('@') == -1) {
   alert("Not an E-Mail-Address!");
   document.contactForm.email.focus();
   return false;
  }
 if(document.contactForm.topic.value == "") {
   alert("Please enter the topic!");
   document.contactForm.topic.focus();
   return false;
  }
 if(document.contactForm.notice.value == "") {
   alert("Please enter the notice!");
   document.contactForm.notice.focus();
   return false;
  }  
  
}