function checkGuestBookFields()
{
	if(document.getElementById("guestbook-name").value == "" || document.getElementById("guestbook-message").value == "")
	{
		alert("Bitte füllen Sie alle Felder aus!");
	}
	else if(EMail(document.getElementById("guestbook-mail").value) == false)
	{
		alert("Bitte geben Sie eine korrekte E-Mail Adresse an!");
	}
	else
	{
		document.getElementById("correct-data").value = "true";
	}
}

function EMail(s)
{
  reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+
                   '(\\@)([a-zA-Z0-9\\-\\.]+)'+
                   '(\\.)([a-zA-Z]{2,4})$');
  res = (reg.test(s));
  
  res = (s.search('@') >= 1 &&
         s.lastIndexOf('.') > s.search('@') &&
         s.lastIndexOf('.') >= s.length-5);

 return(res);
} 

function checkLoginFields()
{
	var str_pass = document.getElementById("login-password").value;
	var str_user = document.getElementById("login-name").value;
	
	if(str_pass == "" || str_user == "")
	{
		alert("Bitte füllen Sie alle Felder aus!");
	}
	else
	{
		var supstring = "";
		for(var i = 0; i < str_pass.length; i++)
		{
			supstring += "0";
		}
		document.getElementById("login-password").value = supstring;
		document.getElementById("login-pass").value = MD5(str_pass);
	}
}