function wopen1(url,w,h) 
{
var posx = Math.floor((screen.width-w)/2);
var posy = Math.floor((screen.height-h)/2)-20;
ret=window.open(url,'varianti','status=false,top='+posy+',left='+posx+',width='+w+',height='+h);
ret.focus();
}

function wopen2(url,w,h) 
{
var posx = Math.floor((screen.width-w)/2);
var posy = Math.floor((screen.height-h)/2)-20;
ret=window.open(url,'varianti','status=false,top='+posy+',left='+posx+',width='+w+',height='+h+',scrollbars=yes');
ret.focus();
}