// Scroller.  Use this script to scroll contents of a DIV with custom buttons


// 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.setAttribute("onmouseover", scrollname + '".scrollUp();"');
			div_up_obj.setAttribute("onmouseout", scrollname + '".stopScroll();"');

			div_dn_obj.setAttribute("onmouseover", scrollname + '".scrollDown();"');
			div_dn_obj.setAttribute("onmouseout", 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;
		this.timeoutID = setTimeout(this.name + ".scrollDown()", 60);
	}
}

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