function validateContactForm(){
    
    var email = document.getElementById('email_field');
    var message = document.getElementById('message_field');
    
    var error = "Veuillez remplir les champs suivants :\n\n";
    var valid = true;
    
    if(email.value == "")
    {
        valid = false;
        error += "- Email\n";
    }
    else if(!checkEmail(email.value))
    {
        valid = false;
        error += "- Email (syntaxe incorrecte)\n";
    }
    
    if(message.value == "")
    {
        valid = false;
        error += "- Message\n"
    }
    
    if(!valid){
        alert(error);
    }
    return valid;
}


function checkEmail(email) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   return reg.test(email);
}

var cptFormPhoto = 0;

function addFormPhotoField(divId){
	var ul = $(divId);
	var li = new Element('li');
	var input = new Element('input', {type: 'file', name: 'file_' + cptFormPhoto});
	li.adopt(input);
	ul.adopt(li);
	cptFormPhoto++;
}