function verifSend() {
	var pre = document.getElementById('vPrenom');
	var mail = document.getElementById('vMail');
	var pre_f = document.getElementById('vDPrenom');
	var mail_f = document.getElementById('vDMail');
	var pre_error = document.getElementById('friend_pre_erro');
	var mail_error = document.getElementById('friend_mail_erro');
	var pre_f_error = document.getElementById('friend_pre_friend_erro');
	var mail_f_error = document.getElementById('friend_mail_friend_erro');
	var fPre = 0;
	var fMail = 0;
	var fPreF = 0;
	var fMailF = 0;
	
	pre_error.style.color = 'red';
	mail_error.style.color = 'red';
	pre_f_error.style.color = 'red';
	mail_f_error.style.color = 'red';
	
	pre_error.style.display = 'block';
	mail_error.style.display = 'block';
	pre_f_error.style.display = 'block';
	mail_f_error.style.display = 'block';
	
	
	if (pre.value.length==0) {
		pre_error.innerHTML = 'Ce champ est obligatoire';
		}
		else {
			pre_error.innerHTML = '';
			fPre = 1;
			}
	if (mail.value.length==0) {
		mail_error.innerHTML = 'Ce champ est obligatoire';
		}
		else {
			if ((verif_email(mail.value))==0) {
				mail_error.innerHTML = 'Cette adresse e-mail n\'est pas valide';
				}
				else {
					mail_error.innerHTML = '';
					fMail = 1;
					}			
			}
	if (pre_f.value.length==0) {
		pre_f_error.innerHTML = 'Ce champ est obligatoire';
		}
		else {
			pre_f_error.innerHTML = '';
			fPreF = 1;
			}
	if (mail_f.value.length==0) {
		mail_f_error.innerHTML = 'Ce champ est obligatoire';
		}
		else {
			if ((verif_email(mail_f.value))==0) {
				mail_f_error.innerHTML = 'Cette adresse e-mail n\'est pas valide';
				}
				else {
					mail_f_error.innerHTML = '';
					fMailF = 1;
					}
			}
	
	if ((fPre==1)&&(fMail==1)&&(fPreF==1)&&(fMailF==1)) {
		document.getElementById('formSendMail').submit();
		}
}



function verif_email(val) {
	p=val.indexOf('@');
    if (p<1 || p==(val.length-1)) {
		return 0;
	}
	else {
		return 1;
	}
}