function maj_quantites(f, num_article, nb_articles) {
   for (i=1; i<=nb_articles; i++)
        eval("f.elements['article[" + i +"][quantite]'].value=0");
   eval("f.elements['article[" + num_article +"][quantite]'].value=1");
}

function Calcul(f)
{
var iLongueur;
	f.cpt.value = f.message.value.length;
}

function PubCalcul(f)
{
var iLongueur;
	f.cpt2.value = f.pub.value.length;
}