var _SCROLLER_SCROLLIMGHANDLER = null;
var _SCROLLER_INTERVAL = 5;
var _SCROLLER_TOP_OFFSET = 0;
var _SCROLLER_SCROLL_AMOUNT = 2;
var _SCROLLER_BOTTOM_OFFSET = 100000;


function scrollerGoUp(scrollerid) {
    var d = document.getElementById(scrollerid);
 
    d.scrollTop = d.scrollTop - _SCROLLER_SCROLL_AMOUNT;
 
    _SCROLLER_SCROLLIMGHANDLER = window.setTimeout(function() {
        scrollerGoUp(scrollerid);
    }, _SCROLLER_INTERVAL);
}
    
    
function scrollerGoDown(scrollerid) {
    var d = document.getElementById(scrollerid);
 
    d.scrollTop = d.scrollTop + _SCROLLER_SCROLL_AMOUNT;
 
    _SCROLLER_SCROLLIMGHANDLER = window.setTimeout(function() {
        scrollerGoDown(scrollerid);
    }, _SCROLLER_INTERVAL);
}
 
 
function scrollerStop( ) {
    window.clearTimeout(_SCROLLER_SCROLLIMGHANDLER);
}
    
    
function scrollerGoBottom(scrollerid) {
    var d = document.getElementById(scrollerid);
    d.scrollTop = _SCROLLER_BOTTOM_OFFSET;
}	
	
	
function scrollerGoTop(scrollerid) {
    var d = document.getElementById(scrollerid);
    d.scrollTop = _SCROLLER_TOP_OFFSET;
}