function popup(mypage,w,h)
{
var poppaWindow=null

LeftPosition=(screen.width)?(screen.width-w)/2:100;
TopPosition=(screen.height)?(screen.height-h)/2:100;
settings='width='+ w + ',height='+ h + ',top=' + TopPosition + ',left=' + LeftPosition + ',scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
poppaWindow=window.open('','ascolto',settings);
poppaWindow.focus();
poppaWindow.location=mypage;
}