function trim (myString)
{
	return myString.replace(/^\s+/g,'').replace(/\s+$/g,'')
} 

function checkform2 ()
{
	var re = new RegExp('^[a-zA-Z0-9\-_]+[a-zA-Z0-9\.\-_]*@[a-zA-Z0-9\-_]+\.[a-zA-Z\.\-_]{1,}[a-zA-Z\-_]+','i');
	email = document.getElementById("email").value;
	tag = document.getElementById("tag").value;
	description = document.getElementById("description").value;
	parrain = trim(document.getElementById("parrain").value);

	if (null == email || email == "")
	{
		alert('Veuillez remplir le champ Email !');
		return false;
	}
	else if (parrain != null && parrain != "" && parrain == email)
	{
		alert('Il est impossible de vous auto-parrainer.');
		return false;
	}
	else if (null == tag || tag == "")
	{
		alert('Veuillez remplir le champ Tag !');
		return false;
	}
	else if (null == description || description == "" || description == "Champ obligatoire : 150 car. maximum")
	{
		alert ('Veuillez remplir le champ Description !');
		return false;
	}

	else if (!(re.test(email)))
	{
		alert ('Email non valide');
		return false;		 
	}
	
	else
		return true;
}

function checkform ()
{
	if (checkform2())
	{
		return true;
	}
	return false;
}