function champsok(){
	
	if (document.form.nom.value.length == 0)
	{
	alert("please, enter name");
	return false;
	}
	if (document.form.ville.value.length  == 0)
	{
	alert("please, enter your city");
	return false;
	}
	if (document.form.pays.value.length  == 0)
	{
	alert("please, enter your country");
	return false;
	}
	email = document.form.email.value;
	var place = email.indexOf("@",1);
	var point = email.indexOf(".",place+1);
	
	if (document.form.email.value.length == 0)
	{
	alert("please, enter your email");
	return false;
	}

	if ((place > -1)&&(email.length >2)&&(point > 1))
		{
		}
	else
		{
		alert("Error email addres");
		return false;
		}
				

if (document.form.message.value.length  == 0)
{
alert("please, enter your message");
return false;
}
	
return true;
}