function update_price_offres(form)
{	
	if (form == "form_complete")
	{
		var nb_choix = 0;	
		var f = document.getElementById(form).elements;
		if (f['langage1'].checked == true)
			nb_choix ++;
		if (f['langage5'].checked == true)
			nb_choix ++;
		if (f['langage6'].checked == true)
			nb_choix ++;		
		document.getElementById('prix_complet').innerHTML = (nb_choix * 55) + '€';
		if (nb_choix == 0)
		{
			f['buy'].disabled = true;			
		}
		else
			f['buy'].disabled = false;
	}
	else
	{
		if (form == "form_prepa")
		{
			var nb_choix = 0;	
			var f = document.getElementById(form).elements;
			if (f['langage1'].checked == true)
				nb_choix ++;
			if (f['langage5'].checked == true)
				nb_choix ++;
			if (f['langage6'].checked == true)
				nb_choix ++;
			document.getElementById('prix_prepa').innerHTML = (nb_choix * 45) + '€';
			if (nb_choix == 0)
			{
				f['buy'].disabled = true;
			}
			else
				f['buy'].disabled = false;
		}
		else			
		{
			var f = document.getElementById('form_testlive').elements;
			if (form == 0)
			{
				f['buy'].disabled = true;
				document.getElementById('prix_tl').innerHTML = (form * 20) + '€';
			}
			else
			{
				f['buy'].disabled = false;
				document.getElementById('prix_tl').innerHTML = (form * 20) + '€';			
				for (var i=1; i<=form; i++)			
					f['langage' + i].value=1;
			}
		}
	}
}