function verifMail(a)
{
	testm = false ;
	
	for (var j=1 ; j<(a.length) ; j++){
		if (a.charAt(j)=='@') {
			if (j<(a.length-4)) {
				for (var k=j ; k<(a.length-2) ; k++) {
					if (a.charAt(k)=='.') testm = true;
	}}}}
	if (!testm){ alert('Format d\'email invalide.');
	}
	return testm ;

}