function verif_insc(form) {

	if (form.nom) {
		if (!form.nom.value) { document.getElementById('warning').style.display='block'; return false;}
		var exp = new RegExp("^[0-9-.]*$","g");
		if (exp.test(form.nom.value)) { document.getElementById('warning').style.display='block'; return false;}
	} 
	if (form.email) {
		if (!form.email.value) { document.getElementById('warning').style.display='block'; return false;}
		var adresse = form.email.value;
		var place = adresse.indexOf("@",1);
		var point = adresse.indexOf(".",place+1);
		if ((place < 0)||(adresse.length < 3)||(point < 2)) {document.getElementById('warning').style.display='block'; return false; }
	}
	if (form.comment) {
		if (!form.comment.value) { document.getElementById('warning').style.display='block'; return false;}
		var exp = new RegExp("^[0-9-.]*$","g");
		if (exp.test(form.comment.value)) { document.getElementById('warning').style.display='block'; return false;}
	} 
	
	return true;

}