function validateForm(f) {
	var errors = "";
	if(f.societe && f.societe.value == "")
		errors = "\n- The company name is required.";
	if(f.nom.value == "")
		errors += "\n- Last name is required.";
	if(f.prenoms.value == "")
		errors += "\n- First name is required.";
	if(f.tel.value == "" || f.tel.value.length < 9)
		errors += "\n- The phone number is required.";
	var email = f.email.value;
	if(email == "")
		errors += "\n- The email address is required.";
	else {
	  var atPos = email.indexOf('@');
	  if(atPos < 1 || atPos == email.length - 1)
			errors += "\n- The email address is not valid.\n";
	}
	if(errors != "") {
		var premiereOccurence = errors.indexOf('-');
		var derniereOccurence = errors.lastIndexOf('-');
		if(premiereOccurence == derniereOccurence)
			alert("Please correct the following error:" + errors);
		else
			alert("Please correct the following errors:" + errors);
		return false;
	}
	return true;
}