var hpos = 0;
var hpos_max = 0;
var hpos_last = -300; 

function slide_1(){
hpos = hpos - 4;
document.getElementById("cbox").style.top = hpos + "px"; 
}

function slide_box(){
slide_1();
if (hpos > hpos_max) setTimeout("slide_box()",100);
}

function slide_all(){
hpos_max = hpos_max - 80;
slide_box(); // ca. 2,5 sec
// setTimeout("slide_all()",6000);
if (hpos <= hpos_last) 
   {
   document.getElementById("cbox").style.top = "0px"; 
   hpos = 0;
   hpos_max = 0;
   slide_all();
   }
else setTimeout("slide_all()",6000);
}

function start_vetrina(quanti)
{
   hpos_last = -(80 * quanti);
   // slide_all();
   setTimeout("slide_all();",6000);
}