function chkFormular()
{
     if(document.form_1.name.value == "")
      {
       alert("Please enter your family name!");
       document.form_1.name.focus();
	   return false;
	  }
      if(document.form_1.name.value.length < 3)
      {
       alert("Please enter a valid family name!");
       document.form_1.name.focus();
	   return false;
	  } 
       
     if(document.form_1.vorname.value == "")
      {
       alert("Please enter your first name!");
       document.form_1.vorname.focus();
	   return false;
	  }  
      if(document.form_1.vorname.value.length < 3)
      {
       alert("Please enter a valid first name!");
       document.form_1.name.focus();
	   return false;
	  } 
     if(document.form_1.strasse.value == "")
      {
       alert("Please enter your street!");
       document.form_1.strasse.focus();
	   return false;
	  }
      if(document.form_1.strasse.value.length < 3)
      {
       alert("Please enter a valid street!");
       document.form_1.strasse.focus();
	   return false;
	  }  
     if(document.form_1.plz.value == "")
      {
       alert("Please enter your Zip code!");
       document.form_1.plz.focus();
	   return false;
	  }  
     if(document.form_1.plz.value.length < 4)
      {
       alert("Please enter a valid Zip code!");
       document.form_1.plz.focus();
	   return false;
	  } 
     if(document.form_1.ort.value == "")
      {
       alert("Please enter your city!");
       document.form_1.ort.focus();
	   return false;
	  }
      if(document.form_1.ort.value.length < 3)
      {
       alert("Please enter a valid city!");
       document.form_1.ort.focus();
	   return false;
	  } 
     if(document.form_1.telefon.value == "")
      {
       alert("Please enter your telephonenumber!");
       document.form_1.telefon.focus();
	   return false;
	  } 
     if(document.form_1.telefon.value.length < 4)
      {
       alert("Please enter a valid telephonenumber!");
       document.form_1.telefon.focus();
	   return false;
	  } 
     if(document.form_1.nationalitaet.value == "")
      {
       alert("Please enter your nationality!");
       document.form_1.nationalitaet.focus();
	   return false;
	  }


     if(document.form_1.geb_datum.value == "" || document.form_1.geb_datum.value == "01.01.1900")
      {
       alert("Please enter your date of birth!");
       document.form_1.geb_datum.focus();
	   return false;
	  }
	 if(document.form_1.geb_ort.value == "")
      {
       alert("Please enter your place of birth!");
       document.form_1.geb_ort.focus();
	   return false;
	  }
}