function verScroll(dir, spd, loop) {
loop = true;
direction = "up";
speed = 10;
scrolltimer = null;
llarg=0;
pos=0;
margeinferior=420;

if (document.layers) {
var page = eval(document.contentLayer);
llarg = document.layers['contentLayer'].clip.height;
pos = document.layers['contentLayer'].top;
}
else {
if (document.getElementById) {
var page= eval("document.getElementById('contentLayer').style");
llarg = document.getElementById('contentLayer').offsetHeight; 
pos = document.getElementById('contentLayer').offsetTop;
}
else {
if (document.all) {
var page = eval(document.all.contentLayer.style);
llarg = document.all['contentLayer'].offsetHeight; 
pos = document.all['contentLayer'].offsetTop;
      }
   }
}

llarg = llarg * -1;
llarg = llarg + margeinferior;

direction = dir;
speed = parseInt(spd);
var y_pos = parseInt(page.top);
if (loop == true) {
if (direction == "dn" && y_pos > llarg) {
page.top = (y_pos - (speed));

} else {
if (direction == "up" && y_pos < 10) {
page.top = (y_pos + (speed));

} else {
if (direction == "top") {
page.top = 10;
      }
   }
}
scrolltimer = setTimeout("verScroll(direction,speed)", 1);
   }
}
function stopScroll() {
loop = false;
clearTimeout(scrolltimer);
}