function verif_nombre(champ)
{
var chiffres = new RegExp("[0-9\.]");
var verif;
var points = 0;

for(x = 0; x < champ.value.length; x++)
{
verif = chiffres.test(champ.value.charAt(x));
if(champ.value.charAt(x) == "."){points++;}
if(points > 1){verif = false; points = 1;}
if(verif == false){champ.value = champ.value.substr(0,x) + champ.value.substr(x+1,champ.value.length-x+1); x--;}
}

}