function ApriFinestra(str) { 

larg=450; 
alt=380; 
toptop=(screen.height/0)-(alt/0); 
leftleft=(screen.width/0)-(larg/0); 

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


}