// JScript File

function check()
{
    if (document.getElementById("Naam").value==0)
    {
    alert("Naam is verplicht!")
    document.getElementById("Naam").style.borderColor = '#FF0000'; 
    return false;
    }
    
    if (/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i.test(document.getElementById("Email").value))
    {
        document.getElementById("Email").style.borderColor = '#000000';
    }
    else
    {
        document.getElementById("Email").focus();
        alert("Ongeldig email adres.");
        document.getElementById("Email").style.borderColor = '#FF0000';
        return false;
    }

    
    if (document.getElementById("Telefoon").value==0)
    {
    alert("Telefoon nummer is verplicht!")
    document.getElementById("Telefoon").style.borderColor = '#FF0000'; 
    return false;
    }
    
    if (document.getElementById("stad").checked){}
    else if (document.getElementById("strand").checked){}
    else
    {
    alert("Vink 1 van de 2 mogelijke uitjes aan!");
    return false;
    }
    
    if (document.getElementById("Personen").value==0){
        alert("Aantal personen is verplicht!")
        document.getElementById("Personen").style.borderColor = '#FF0000'; 
        return false;
    }else if (!IsNumeric(document.getElementById("Personen").value)){
        alert("Aantal personen is geen getal!")
        document.getElementById("Personen").style.borderColor = '#FF0000'; 
        return false;
    }
    
    
}

function IsNumeric(strString)
   //  check for valid numeric strings	
   {
   var strValidChars = "0123456789";
   var strChar;
   var blnResult = true;

   if (strString.length == 0) return false;

   //  test strString consists of valid characters listed above
   for (i = 0; i < strString.length && blnResult == true; i++)
      {
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
         {
         blnResult = false;
         }
      }
   return blnResult;
   }