function estMail(ch)
{
    return ch.indexOf("@")!=-1 ? ch.substring(ch.indexOf("@")).indexOf(".")!=-1 : false ;
}


function verif()
{
        var variable ="";
    if (document.forms['testform'].nom.value.length!=0)
    {
        if (document.forms['testform'].tel.value.length!=0)
        {
            if (estMail(document.forms['testform'].email.value)) 
            {
				return true;
            }
            else
            {
                variable="e-mail";
            }
        }
        else
        {
            variable="telephone";
        }
    }
    else
    {
        variable="nom";
    }
    window.alert ("le champs "+variable+" n'est pas correct ou vide !! ");
    return false;
}

function verif_en()
{
	var variable ="";
    if (document.forms['testform'].nom.value.length!=0)
    {
        if (document.forms['testform'].tel.value.length!=0)
        {
            if (estMail(document.forms['testform'].email.value)) 
            {
				return true;
            }
            else
            {
                variable="'Email adress'";
            }
        }
        else
        {
            variable="'Telephone number";
        }
    }
    else
    {
        variable="'Name'";
    }
    window.alert ("The field "+variable+" is either incorrect or empty !! ");
    return false;
}