var speed=2;
var crossobj = "";
var down = 0;
var up = 0;
var contentheight = "";
var contentwidth = "";
var iens6 = "";
var ns4 = "";


function inici(content)
{
	//comprovant quin navegador está fent servir l'usuari...
	iens6=document.all||document.getElementById;
	ns4=document.layers;
	getcontent_height();
	crossobj=document.getElementById? document.getElementById(content) : document.all.content;
	contentheight=crossobj.offsetHeight;
}

//mou cap avall el contingut
function movedown(){

if (window.moveupvar) clearTimeout(moveupvar)
if (iens6&&parseInt(crossobj.style.top)>=(contentheight*(-1)+100))
{
crossobj.style.top=parseInt(crossobj.style.top)-speed+"px";
}
else if (ns4&&crossobj.top>=(contentheight*(-1)+100))
{
crossobj.top-= speed;
}
movedownvar=setTimeout("movedown()",20);
}

//mou cap amunt el contingut
function moveup(){
if (window.movedownvar) clearTimeout(movedownvar)
if (iens6&&parseInt(crossobj.style.top)<=0)
crossobj.style.top=parseInt(crossobj.style.top)+speed+"px"
else if (ns4&&crossobj.top<=0)
crossobj.top+=speed
moveupvar=setTimeout("moveup()",20)
}



//para el moviment
function stopscroll(){
if (window.moveupvar) clearTimeout(moveupvar)
if (window.movedownvar) clearTimeout(movedownvar)
}

function getcontent_height(){
if (iens6)
		contentheight=crossobj.offsetHeight;
else if (ns4)
		document.nscontainer.document.nscontent.visibility="show";
}