function aufklappen(element)
{
var status = document.getElementById(element).style.display;
document.getElementById('cd1').style.display = 'none';
document.getElementById('cd2').style.display = 'none';
if(status == "none"){document.getElementById(element).style.display = "block";}
}

function toggleMe(item){
		  var e=document.getElementById(item);
		  if(!e)return true;
		  if(e.style.display=="none"){
			e.style.display="block"
		  } else {
			e.style.display="none"
		  }
		  return true;
		}
function toggleYou(item){
		  
		  var a=document.getElementById(item);
		  if(!a)return true;
		  if(a.style.display=="none"){
			a.style.display="block"
		  } else {
		  a.style.display="none"
		  }
		  return true;
		}
				
	   function chkWkForm(){
	   var      form = document.wkForm;

	  if      (!form.vorname.value) {
              alert('Please enter your first name !');
              form.vorname.focus();
              return false;
     }
     if      (!form.nachname.value) {
              alert('Please enter your name !');
              form.nachname.focus();
              return false;
     }
     if      (!form.email.value || emailNichtGueltig(form.email)) {
              alert('Please enter correct e-mail-adress !');
              form.email.focus();
              return false;
     }
	 if      (!form.strasse.value) {
              alert('Please fill in the complete address !');
              form.strasse.focus();
              return false;
     }
	 if      (!form.stadt.value) {
              alert('Please enter your city !');
              form.stadt.focus();
              return false;
     }
	 if      (!form.land.value) {
              alert('Please enter your country !');
              form.land.focus();
              return false;
     }
	 if      (!form.anzahl.value) {
              alert('Please enter quantity of copies !');
              form.anzahl.focus();
              return false;
     }
	return true;
	}

 function chkWkFormcd1(){
	   var      form = document.wkFormcd1;

	  if      (!form.vorname.value) {
              alert('Please enter your first name !');
              form.vorname.focus();
              return false;
     }
     if      (!form.nachname.value) {
              alert('Please enter your name !');
              form.nachname.focus();
              return false;
     }
     if      (!form.email.value || emailNichtGueltig(form.email)) {
              alert('Please enter correct e-mail-adress !');
              form.email.focus();
              return false;
     }
	 if      (!form.strasse.value) {
              alert('Please fill in the complete address !');
              form.strasse.focus();
              return false;
     }
	 if      (!form.stadt.value) {
              alert('Please enter your city !');
              form.stadt.focus();
              return false;
     }
	 if      (!form.land.value) {
              alert('Please enter your country !');
              form.land.focus();
              return false;
     }
	 if      (!form.anzahl.value) {
              alert('Please enter quantity of copies !');
              form.anzahl.focus();
              return false;
     }
	return true;
	}

	
function emailNichtGueltig(email) {
     emailText = email.value;
     if      (!emailText.match(/^([a-zA-Z0-9._-]*)@[a-zA-Z0-9._-]+(\.[a-zA-Z0-9._-]*)+$/i))
              return true;
     else     return false;
   }