/* NvScroll() 시작 */
function NvScroll() {

	this.version = "0.2";
	this.name = "NvScroll";
	this.item = new Array();
	this.itemcount = 0;
	this.currentspeed = 0;
	this.scrollspeed = 50;
	this.pausedelay = 1000;
	this.pausemouseover = false;
	this.stop = false;
	this.type = 1;
	this.height = 100;
	this.width = 100;
	this.stopHeight = 0;
	this.i = 0;

	this.add = function() {
		var text = arguments[0];
		this.item[this.itemcount] = text;
		this.itemcount = this.itemcount + 1;
	};

	this.add2 = function() {
		var url = arguments[0];
		var title = arguments[1];
		this.item[this.itemcount] = "<a href=" + url + ">" + title + "</a>";
		this.itemcount = this.itemcount + 1;
	};

	this.start = function() {
		if (this.itemcount == 1) {
			this.add(this.item[0]);
		}
		this.display();
		this.currentspeed = this.scrollspeed;
		if (this.type == 1 || this.type == 2) {
			this.stop = true;
			setTimeout(this.name + '.scroll()', this.currentspeed);
			window.setTimeout(this.name + ".stop = false", this.pausedelay);
		} else if (this.type == 3) {
			this.stop = true;
			setTimeout(this.name + '.rolling()', this.currentspeed);
			window.setTimeout(this.name + ".stop = false", this.pausedelay);
		}
	};

	this.display = function() {
		document.write('<div id="' + this.name + '" style="height:' + this.height + '; width:' + this.width + '; position:relative; overflow:hidden; " OnMouseOver="' + this.name + '.onmouseover(); " OnMouseOut="' + this.name + '.onmouseout(); ">');
		for (var i = 0; i < this.itemcount; i++) {
			if (this.type == 1) {
				document.write('<div id="' + this.name + 'item' + i + '"style="left:0px; width:' + this.width + '; position:absolute; top:' + (this.height * i) + 'px; ">');
				document.write(this.item[i]);
				document.write('</div>');
			} else if (this.type == 2 || this.type == 3) {
				document.write('<div id="' + this.name + 'item' + i + '"style="left:' + (this.width * i) + 'px; width:' + this.width + '; position:absolute; top:0px; ">');
				document.write(this.item[i]);
				document.write('</div>');
			}
		}
		document.write('</div>');
	};

	this.scroll = function() {

		if (this.pause == true) {

			window.setTimeout(this.name + ".scroll()", this.pausedelay);
			this.pause = false;

		} else {

			this.currentspeed = this.scrollspeed;
		
			if (!this.stop) {
		
				for (i = 0; i < this.itemcount; i++) {
					obj = document.getElementById(this.name + 'item' + i).style;

					if (this.type == 1) {
						obj.top = parseInt(obj.top) - 1;
					
						if (parseInt(obj.top) <= this.height * ( - 1)) obj.top = this.height * (this.itemcount - 1);
							if (parseInt(obj.top) == 0) this.currentspeed = this.pausedelay;
					} else if (this.type == 2) {
						obj.left = parseInt(obj.left) - 1;
						if (parseInt(obj.left) <= this.width * ( - 1)) obj.left = this.width * (this.itemcount - 1);
							if (parseInt(obj.left) == 0) this.currentspeed = this.pausedelay;
					}
				}
			}
			window.setTimeout(this.name + ".scroll()", this.currentspeed);
		}
	};

	this.rolling = function() {
		if (this.stop == false) {
			this.next();
		}
		window.setTimeout(this.name + ".rolling()", this.scrollspeed);
	}

	this.onmouseover = function() {
		if (this.pausemouseover) {
			this.stop = true;
		}
	};

	this.onmouseout = function() {
		if (this.pausemouseover) {
			this.stop = false;
		}
	};

	this.next = function() {

		for (i = 0; i < this.itemcount; i++) {
			obj = document.getElementById(this.name + 'item' + i).style;
			if (parseInt(obj.left) < 1) {
				width = this.width + parseInt(obj.left);
				break;
			}
		}
		for (i = 0; i < this.itemcount; i++) {
			obj = document.getElementById(this.name + 'item' + i).style;
			if (parseInt(obj.left) < 1) {
				obj.left = this.width * (this.itemcount - 1);
			} else {
				obj.left = parseInt(obj.left) - width;
			}
		}

	}

	this.prev = function() {

		for (i = 0; i < this.itemcount; i++) {
			obj = document.getElementById(this.name + 'item' + i).style;
			if (parseInt(obj.left) < 1) {
				width = parseInt(obj.left) * ( - 1);
				break;
			}
		}
		if (width == 0) {
			total_width = this.width * (this.itemcount - 1);
			for (i = 0; i < this.itemcount; i++) {
				obj = document.getElementById(this.name + 'item' + i).style;
				if (parseInt(obj.left) + 1 > total_width) {
					obj.left = 0;
				} else {
					obj.left = parseInt(obj.left) + this.width;
				}
			}
		} else {
			for (i = 0; i < this.itemcount; i++) {
				obj = document.getElementById(this.name + 'item' + i).style;
				if (parseInt(obj.left) < 1) {
					obj.left = 0;
				} else {
					obj.left = parseInt(obj.left) + width;
				}
			}
		}
	}

	this.unext = function() {
		this.onmouseover();
		this.next();
		window.setTimeout(this.name + ".onmouseout()", this.pausedelay);
	}

	this.uprev = function() {
		this.onmouseover();
		this.prev();
		window.setTimeout(this.name + ".onmouseout()", this.pausedelay);
	}

}
/* NvScroll() 끝 */