function afficherForm(){
	var divFormEnvoiRecette = document.getElementById('envoiRecette');
	if(divFormEnvoiRecette.style.display == 'block'){
		divFormEnvoiRecette.style.display = 'none';
		opacity('envoiRecette', 100, 0, 300);
	}else{
		divFormEnvoiRecette.style.display = 'block';
		opacity('envoiRecette', 0, 100, 300);
	}
}
function validerForm(){
	var form = document.getElementById('formEnvoiRecette');
	if(form.nomEnvoiRecette.value != '' && form.mailEnvoiRecette.value != '' && form.mailDestEnvoiRecette.value != ''){
		//alert('coucou');
		form.submit();
	}else{
		alert('Tous les champs sont obligatoires.');
	}
}

function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}

function opacity(id, opacStart, opacEnd, millisec) {
    var object = document.getElementById(id);
	object.style.display = 'block';
    var speed = Math.round(millisec / 100);
    var timer = 0;
	if(opacStart > opacEnd) {
		
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
		setTimeout("document.getElementById('"+id+"').style.display = 'none';",(timer * speed*2));
	} else if(opacStart < opacEnd) {
		
		for(i = opacStart; i <= opacEnd; i++) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
		afficheOpacity();
	}
}