function checkMail(mail){
    var er = new RegExp(/^[A-Za-z0-9_\-\.]+@[A-Za-z0-9_\-\.]{2,}\.[A-Za-z0-9]{2,}(\.[A-Za-z0-9])?/);
    
        if(er.test(mail.value)) 
		{
				return true;
		}
        else
		{
				return false;
		}
}

function validateForm(mail, langue)
{
	
    if (checkMail(mail)){
		messageTO = "";
		return true;
	}
	else{
			
			if(langue == "english")
				var messageTO = "Invalid email";
			else
				var messageTO = "Adresse électronique erronée";
			
			divElement = document.getElementById('messageNL');
			divElement.innerHTML = messageTO;
			return false;
	}	    
}