function appari_modulo(modulo){

dim_x=520;
dim_y=600;
var newwin;


var l = screen.width;
var a = screen.height;

	
	var wi = (l-dim_x)/2;
	var he = (a-dim_y)/2;
	
	
	w=window.open(modulo,"aa","location=no,menubar=no,status=no,toolbar=no,scrollbars=yes,resizable=no,width="+dim_x+",height="+dim_y);
       w.focus();
       w.moveTo(wi,he)        









}