function limitercheckbox(form, champ_a_controler, nb_limite)
{
	var limite = nb_limite;
	var nbre = 0;
	var nbre_check = 0;
	
	nom = document.forms[ form ].elements[ champ_a_controler ];
	nbre_check = nom.length;
	if(nbre_check == null) nbre_check = 1;
	
	for(i = 0; i < nbre_check; i++)
	{
		if(nom[ i ].checked == true) nbre++;
	}
	
	if(nbre >= limite)
	{
		for(i = 0; i < nbre_check; i++)
		{
			if(nom[ i ].checked == false) nom[ i ].disabled = true;
		}
	}
	else
	{
		for(i = 0; i < nbre_check; i++)
		{
			if(nom[ i ].checked == false) nom[ i ].disabled = false;
		}
	}
}