////////////////////////////////////////////////////////
/* divID OEFFNEN/SCHLIESSEN *///////////////////////////
////////////////////////////////////////////////////////
function displayID(divID){
            var new_stat = 'block';
            if (document.getElementById){
                      var elem = document.getElementById(divID);
                      new_stat = elem.style.display == 'block' ? 'none' : 'block';
                      elem.style.display = new_stat;
            }
            return new_stat;
}

////////////////////////////////////////////////////////
/* Formular auf Name und E-Mail checken *** ENGLISH *///
////////////////////////////////////////////////////////
function checkform(formular)
{
//überprüfung, ob überhaupt etwas eingetragen wurde
if (document.getElementById("name" + formular).value == '' || document.getElementById("name" + formular).value == 'Name'){
         alert('Please enter your name!');
         document.getElementById("name" + formular).focus();
         return(false);
}
if (document.getElementById("email" + formular).value == '' || document.getElementById("email" + formular).value == 'Email'){
         alert('Please enter your email-address!');
         document.getElementById("email" + formular).focus();
         return(false);
}

//email adresse auf leerzeichen überprüfen
if(document.getElementById("email" + formular).value.search(/ /) != '-1'){
         alert('Space characters are not alowed in email-addresses!');
         document.getElementById("email" + formular).focus();
         return(false);
}

//email-Format überprüfen
s = document.getElementById("email" + formular).value.split(/@/);

//bei einem @ kann es nur 2 teile geben
if((s.length !=2) || s[0] == '' || s[1] == ''){
         alert('The email-address has a wrong format!');
         document.getElementById("email" + formular).focus();
         return(false);
}

//nach dem @ zeichen ein punkt
if (s[1].indexOf(".") == '-1'){
         alert('The email-address must include at least one dot after the @ !');
         document.getElementById("email" + formular).focus();
         return(false);
         }

var a,b;

a = document.getElementById("email" + formular).value.split(/[.]/);
b = a.reverse();
if (b[0].length != "2" &&  b[0].length != "3" && b[0].length != "4"){
         alert('The TopLevelDomain of the e-Mail is not valid!');
         document.getElementById("email" + formular).style.border = "1px solid #E00536";
         document.getElementById("email" + formular).focus();
         return(false);
}

//uncrypt recipient
var recipientStat = document.getElementById("recipient_" + formular).value;
document.getElementById("recipient_" + formular).value = decryptString(recipientStat,-2);
document.getElementsByName("kontakt").reset();

}


////////////////////////////////////////////////////////
/* decrypt helper function *////////////////////////////
////////////////////////////////////////////////////////
function decryptCharcode(n,start,end,offset){
        n = n + offset;
        if (offset > 0 && n > end){
                n = start + (n - end - 1);
                } else if (offset < 0 && n < start){
                n = end - (start - n - 1);
        }
        return String.fromCharCode(n);
}
////////////////////////////////////////////////////////
/* decrypt string */////////////////////////////////////
////////////////////////////////////////////////////////
function decryptString(enc,offset){
        var dec = "";
        var len = enc.length;
        for(var i=0; i < len; i++){
                var n = enc.charCodeAt(i);
                if (n >= 0x2B && n <= 0x3A){
                        dec += decryptCharcode(n,0x2B,0x3A,offset);        // 0-9 . , - + / :
                } else if (n >= 0x40 && n <= 0x5A){
                        dec += decryptCharcode(n,0x40,0x5A,offset);        // A-Z @
                } else if (n >= 0x61 && n <= 0x7A){
                        dec += decryptCharcode(n,0x61,0x7A,offset);        // a-z
                } else {
                        dec += enc.charAt(i);
                }
        }
        return dec;
}
////////////////////////////////////////////////////////
/* decrypt spam-protected emails *//////////////////////
////////////////////////////////////////////////////////

function linkTo_UnCryptMailto(s){
        location.href = decryptString(s,-2);
}