function activeDate(cible)
{
	if(cible.checked)
	{
		var value = false;
	}
	else
	{
		var value = true;
	}
	
	if(cible.id == 'du')
	{
		document.getElementById('date_debut').disabled = value;
	}
	else if(cible.id == 'au')
	{
		document.getElementById('date_fin').disabled = value;
	}
}

function setCheckbox(du, au)
{
	if(du == 1)
	{
		obj = document.getElementById('du');
		obj.checked = true;
		activeDate(obj);
	}
	
	if(au == 1)
	{
		obj = document.getElementById('au');
		obj.checked = true;
		activeDate(obj);
	}
}