//
// File    : nvscroll.js
// Author  : Kim So Hee 
// Date    : 2005. 11. 7 
//

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(sp,ep) {
		var pagenum = document.getElementById('pagenum'); 
		pagenum.innerHTML=" ("+sp+"/"+ep+" screen)";

		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(sp,ep) {
		var pagenum = document.getElementsByName('pagenum')[0]; 
		pagenum.innerText=" ("+sp+"/"+ep+" screen)";

		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 (sp,ep) {
		this.onmouseover();
		this.next(sp,ep);
		window.setTimeout(this.name+".onmouseout()",this.pausedelay);
	}

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

}

function ShowNoImg(o,kind) {
	//if (rErr[o.name]) {
	//	o.height=100;
	//	o.width=100;
	if (kind == 2) {
		o.src='http://www.happycampus.com/images/knowledge/directory/noimg_word01.gif';
	} else {
		o.src='http://www.happycampus.com/images/knowledge/directory/noimg_power01.gif';
	}
		o.onerror=null;
	//} else {
	//	rErr[o.name]=true;
	//	o.width=120;
	//	o.src=url;
	//	if ( o.height > 120 ) {
	//		o.height = 120;
	//	}
	//}
	return;
}