/*
window.addEvent('domready', function(){
				var scroll = new Fx.Scroll('description', {
					wait: false,
					duration: 200,
					transition: Fx.Transitions.Quad.easeInOut
				});

				var slided = 0;
				

				$('down_link').addEvent('mouseover', function(event) {
				event = new Event(event).stop();
				var height = ($('lyr1').getSize().size.y);
				var toMove = 20;
				slided += toMove;
				slided = Math.min(slided,height);
				scroll.scrollTo(0, slided);
				

				});

				$('up_link').addEvent('mouseover', function(event) {
					event = new Event(event).stop();
					var toMove = Math.max(-20,-slided);
					slided += toMove;
					scroll.scrollTo(0, slided);
				});	
	
});
*/

// gives up and down scroll buttons to images, spans, ... named up_name, down_name, respectively.
// will keep the default scroll_box's style overflow if it encounters errors (so make overflow: auto;)

// usage: put this after the scrollbox div:  var div_scroll1 = new TextScroll('div_scroll1', 'scroll_box');
function TextScroll(scrollname, div_name, up_name, down_name)
{
    this.div_name = div_name;
    this.name = scrollname;
    this.scrollCursor = 0;
    this.speed = 5;
    this.timeoutID = 0;
    this.div_obj = null;
    this.up_name = up_name;
    this.dn_name = down_name;

{
        if (document.getElementById) {
            div_obj = document.getElementById(this.div_name);
            if (div_obj) {
                this.div_obj = div_obj;
                this.div_obj.style.overflow = 'hidden';
            }
            div_up_obj = document.getElementById(this.up_name);
            div_dn_obj = document.getElementById(this.dn_name);
            if (div_up_obj && div_dn_obj) {
div_up_obj.onmouseover = function() { eval(scrollname + ".scrollUp();") };
div_up_obj.onmouseout = function() { eval(scrollname + ".stopScroll();") };

div_dn_obj.onmouseover = function() { eval(scrollname + ".scrollDown();") };
div_dn_obj.onmouseout = function() { eval(scrollname + ".stopScroll();") };
            }
        }
    }

this.stopScroll = function() {
        clearTimeout(this.timeoutID);
    }

this.scrollUp = function() {
        if (this.div_obj) {
            this.scrollCursor = (this.scrollCursor - this.speed) < 0 ? 0 : this.scrollCursor - this.speed;
            this.div_obj.scrollTop = this.scrollCursor;
            this.timeoutID = setTimeout(this.name + ".scrollUp()", 60);
        }
    }

this.scrollDown = function() {
        if (this.div_obj) {
            this.scrollCursor += this.speed;
            this.div_obj.scrollTop = this.scrollCursor;
			if (this.div_obj.scrollTop == this.scrollCursor) {
			this.timeoutID = setTimeout(this.name + ".scrollDown()", 60);
			} else {
			this.scrollCursor = this.div_obj.scrollTop;
			}    
		}
    }

this.resetScroll = function() {
        if (this.div_obj) {
            this.div_obj.scrollTop = 0;
            this.scrollCursor = 0;
        }
    }
}