var feature = "";
var myWidth = 785;
var myHeight = 550;
var myLeft = (screen.width-myWidth)/2;
var myTop = (screen.height-myHeight)/2;
var features = "'toolbar=no,location=no,status=yes,menubar=no,scrollbars=no,resizable=no,titlebar=0'";
features += ",left="+myLeft+",top="+myTop;
features += ",width="+myWidth+",height="+myHeight;

function invia(questo) {
		nome = "mostra";
		quadro = window.open(questo,nome,features);
}