var pos = 0;
var tim
var stp = 5; // quantitat de desplaçament
var spd = 50; // velocitat de desplaçament
var lwr = 0;    // limit inferior
var clipHeight = '409';

var llarg
function init() {
	if (document.getElementById("scrollContent")) {
		llarg = document.getElementById("scrollContent").offsetHeight;
	}
	//alert(llarg); 
}

window.onload=init;

//scroll amunt
function scroll_amunt() {
	pos = document.getElementById("scrollContent").offsetTop;
	upr = ( clipHeight - llarg  )
	if(pos > upr) pos -= stp;
	fes_scroll(pos,"scrollContent","scrollWindow");  
	tim = setTimeout("scroll_amunt()", spd);
}
	




//scroll avall
function scroll_avall() {
		pos = document.getElementById("scrollContent").offsetTop;
		upr = (clipHeight - llarg);
		if(pos < lwr) pos += stp;
		fes_scroll(pos,"scrollContent","scrollWindow");
		tim = setTimeout("scroll_avall()", spd);
}
	
	
//aplica la posició
	function fes_scroll(pos,filla,mare) {
		document.getElementById(filla).style.top=pos+"px";//mozilla i netscape 6
	}
	
//neteja temps	
function nofer_scroll() {
		clearTimeout(tim);
}