function popup(pagina,titolo,w,h,barre) {
	var py = (screen.availHeight/2)-(h/2)
	var px = (screen.availWidth/2)-(w/2)
	var parametri = "width=" + w + ",height=" + h + ",screenX=" + px + ",screenY=" + py
	parametri = parametri + ",left=" + px + ",top=" + py
	if (barre==1) {parametri = parametri + ",scrollbars=yes"}
	void window.open(pagina,titolo,parametri)
	}
	
function checkmail(mail) {
	var checkmail = true
	mail = mail.toLowerCase()
	var p = mail.indexOf("@")
	var pl = mail.lastIndexOf("@")
	if (p!=pl) {checkmail = false}
	if (p<=1) {checkmail = false}
	mail = mail.substr(p+1)
	if (mail.length<=2) {checkmail = false}
	p = mail.indexOf(".")
	if (p<=1) {checkmail = false}
	mail = mail.substr(p+1)
	if (mail.length<2) {checkmail = false}
	return checkmail
	}