function chat()
{ 
    window.open('http://chat.studenti.it/','chat',"history=no,toolbar=no,location=no,border=0,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=550,height=400");
}
function chat_giovani()
{ 
    window.open('http://chat.giovani.it/popup.php','chat',"history=no,toolbar=no,location=no,border=0,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=900,height=800");
}

function UpdateCounter(Form)
{
    maxInput = 145;
    if (Form.testo.value.length > maxInput) {
        alert("Attenzione: i caratteri a disposizione sono " + maxInput);
        Form.testo.value = Form.testo.value.substring(0, maxInput);
        Disp = 0;
    } else {
        Disp = maxInput - Form.testo.value.length;
    }
    Form.counter.value = Disp;
}

function aprid(dest,larg,alt)
{
    window.open(dest,'',"history=no,toolbar=no,location=no,border=0,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,width="+larg+",height="+alt);
}

function popup(url,nome,alt,lung,left,top) 
{
    window.open(url,nome,'history=no,toolbar=no,location=no,border=0,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width='+lung+',height='+alt+',left='+left+',top='+top);
}

function popnum()
{
    window.open('/member/ricarica/numero.php', '320204344','history=no,toolbar=no,location=no,border=0,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=290,height=193');
}

// cancella il testo predefinito di un campo input
function cancInp(campo, testoPredef)
{
    if (campo.value == testoPredef) {
        campo.value = '';
    }
}