function switch_spoiler(div2)
{
var divs = div2.getElementsByTagName('div');
var div3 = divs[0];
        if (div3.style.visibility == 'visible')
        div3.style.visibility = 'hidden';
        else
        div3.style.visibility = 'visible';
return true;
}

function valid_concours()
	{
	var test = true;
	var msg = "";
	
	if(document.getElementById('nom').value == "")
		test = false;
	else if(document.getElementById('prenom').value == "")
		test = false;
	else if(document.getElementById('adr_1').value == "")
		test = false;
	else if(document.getElementById('cp').value == "")
		test = false;
	else if(document.getElementById('ville').value == "")
		test = false;
	else if(document.getElementById('pays').value == "")
		test = false;
	else if(document.getElementById('email').value == "")
		test = false;
		
	if(test == false)
		{
		alert("Merci de renseigner tous les champs obligatoires");
		return false;
		}
	else
		{
		if(document.getElementById('lu').checked == false)
			{
			alert("Vous devez accepter le réglement du concours");
			return false;
			}
		else
			return true;
		}
		
	}