// 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,-1);
}

//check user input
function check_input() 
{
    var vorname  = document.getElementById('vorname'); 
    var nachname = document.getElementById('nachname'); 
    var firma    = document.getElementById('firma'); 
    var email    = document.getElementById('email');
    
    var sendok = true;
    
    if(vorname.value.length < 3)
    {
        sendok = false; 
    } 
    
    if(nachname.value.length < 3)
    {
        sendok = false; 
    } 
    
    if(firma.value.length < 3)
    {
        sendok = false; 
    } 
    
    if(email.value.length < 3)
    {
        sendok = false; 
    } 
    
    if(sendok)
    {
        document.forms["myform"].submit();
    } else
    {
        alert("Bitte geben Sie alle Daten ein!");  
    }
    
}

function submit_true()
{
    var hidden_input    = document.getElementById('true');
    
    hidden_input.value = "1";
     
    document.forms["myform2"].submit();    
}

function submit_false()
{
    var hidden_input    = document.getElementById('true');
    
    hidden_input.value = "0";
     
    document.forms["myform2"].submit();    
}