function validEmail(email) {
  var strReg = "^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$";
  var regex = new RegExp(strReg);
  return(regex.test(email));
}

function checkInputAll(){
	document.forms["Support"].elements["melden"].disabled = false;
	document.forms["Support"].elements["melden"].value = "Wird gesendet ...";
	checkInputEmail();
	checkInputGrund();
	checkInputNick()
	
	if(!checkInputNick()){
		document.forms["Support"].elements["melden"].disabled = false;
		document.forms["Support"].elements["melden"].value = "Abschicken";	
		return false;
	}
	if(!checkInputEmail()){
		document.forms["Support"].elements["melden"].disabled = false;
		document.forms["Support"].elements["melden"].value = "Abschicken";		
		return false;
	}
	if(!checkInputGrund()){
		document.forms["Support"].elements["melden"].disabled = false;
		document.forms["Support"].elements["melden"].value = "Abschicken";		
		return false;
	}

}

function checkInputNick(){
	if(document.Support.nick.value == ""){ 
		document.getElementById(11).style.display = "none";
		document.getElementById(12).style.display = "block";
		return false;
	} 
	else{ 
		document.getElementById(11).style.display = "block";
		document.getElementById(12).style.display = "none";
		return true;
	}
}
function checkInputEmail(){
	if (!validEmail(document.Support.email.value))
	{
		document.getElementById(14).style.display = "block";
		document.getElementById(13).style.display = "none";
		return false;
	} 
	else
	{ 
		document.getElementById(13).style.display = "block";
		document.getElementById(14).style.display = "none";
		return true;
	}
}
function checkInputGrund(){
	if (document.Support.grund.value == "")
	{
		document.getElementById(16).style.display = "block";
		document.getElementById(15).style.display = "none";
		return false;
	} 
	else
	{ 
		document.getElementById(15).style.display = "block";
		document.getElementById(16).style.display = "none";
		return true;
	}
}

function resetInput(){
	document.getElementById(11).style.display = "none";
	document.getElementById(12).style.display = "none";
	document.getElementById(13).style.display = "none";
	document.getElementById(14).style.display = "none";
	document.getElementById(15).style.display = "none";
	document.getElementById(16).style.display = "none";
	document.getElementById(17).style.display = "none";
}