function contact(taal_id)
{
	var error_message = "";

	if(document.vraagform.Naam.value == "")
	{
	    if (taal_id == "2")
		{
			error_message = "Naam is een verplicht veld"
		}
		else
		{
			error_message = "Name is an obligatory field"
		}
	}
	else if(document.vraagform.Telefoon.value == "")
	{
	    if (taal_id == "2")
		{
			error_message = "Telefoon is een verplicht veld"
		}
		else
		{
			error_message = "Telephone is an obligatory field"
		}		
	}
	else if(document.vraagform.from.value == "")
	{
	    if (taal_id == "2")
		{
			error_message = "E-mail is een verplicht veld"
		}
		else
		{
			error_message = "E-mail is an obligatory field"
		}		
	}	
	else if(document.vraagform.from.value != "")
	{
		if (checkMail(document.vraagform.from.value) == false)
		{
			if (taal_id == "2")
			{
				error_message = "Het ingevulde email is geen geldige email"
			}
			else
			{
				error_message = "The filled e-mail is not a valid e-mail"
			}			
		}	
	}	
	
	
	if (error_message == "")
	{
		document.vraagform.to.value = document.vraagform.to.value + "," + document.vraagform.from.value;
		document.vraagform.submit();
	}
	else
	{		
		alert(error_message);
	}
}

function checkMail(sMail)
{	

	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(sMail)) 
	{
		var IsEmail=true;
	}
	else
	{
		var IsEmail=false;
	}
	return IsEmail;
}