function ApriFinestra(str) { 

larg=386
alt=310 
toptop=(screen.height/2)-(alt/2)
leftleft=(screen.width/2)-(larg/2)

searchWin = window.open(str,'','top='+toptop+',left='+leftleft+',scrollbars=no,width='+larg+',height='+alt+',status=no,location=no,toolbar=no'); 

}