function NvScroll() {
	this.version = "0.2";
	this.name = "NvScroll";
	this.divId = "list";
	this.item = new Array();
	this.itemcount = 0;
	this.currentspeed = 0;
	this.scrollspeed = 50;
	this.pausedelay = 1000;
	this.pausemouseover = false;
	this.stop = false;
	this.height = 100;
	this.width = 100;
	this.stopHeight=0;
	this.i=0;
	this.reloadData = 0;
	this.scrollTimer; 
	this.stopTimer ; 
	this.rollingTimer ;

	this.add = function () {
		var text = arguments[0];
		this.item[this.itemcount] = text;
		this.itemcount = this.itemcount + 1;
	};
	
	this.clearitem = function () {		
		clearTimeout(this.scrollTimer) ;
		clearTimeout(this.stopTimer) ;
		clearTimeout(this.rollingTimer) ;
		this.stop = true ;
		this.item = new Array();
		this.itemcount = 0;
		this.i=0;
		this.reloadData = 0;
		var oList ;
        oList = document.getElementById(this.divId) ;
        if(oList){			
			oList.innerHTML = "" ;  
		}
	}

	this.start = function () {
		if ( this.itemcount == 1 ) {
			this.add(this.item[0]);
		}
		this.display();		
		this.currentspeed = this.scrollspeed;
		this.stop = true;
		this.scrollTimer = setTimeout(this.name+'.scroll()',this.currentspeed);
		this.stopTimer = window.setTimeout(this.name+".stop = false", this.pausedelay);
	};
	
	this.display = function () {
        var htmlCode;
		htmlCode = '<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++) {
			htmlCode += '<div id="'+this.name+'item'+i+'"style="left:0px; width:'+this.width+'; position:absolute; top:'+(this.height*i + 40)+'px; ">';
			htmlCode += this.item[i];
			htmlCode += '</div>';
		}
		htmlCode += '</div>';
		var oList ;
        oList = document.getElementById(this.divId) ;
        if(oList){
			oList.innerHTML=htmlCode;  
	   }
	};
	
	this.scroll = function () {
		if ( this.pause == true ) {
			this.scrollTimer = window.setTimeout(this.name+".scroll()",this.pausedelay);
			this.pause = false;
		} else {
			this.currentspeed = this.scrollspeed;
			if ( !this.stop ) {
				for (var i = 0; i < this.itemcount; i++) {
					obj = document.getElementById(this.name+'item'+i).style;
					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;
						this.i = i;
					}
				}
			}
            if( !this.stop && i == this.itemcount && parseInt(obj.top) == 0 && this.reloadData == 1 ) {
				this.reloadData = 0;
            }
            else {
				this.scrollTimer = window.setTimeout(this.name+".scroll()",this.currentspeed);
            }
		}
	};
	
	this.rolling = function () {
		if ( this.stop == false  ) {
			this.next();
		}
		this.rollingTimer = window.setTimeout(this.name+".rolling()",this.scrollspeed);
	}
	
	this.onmouseover = function () {
		//if( this.i < 5 ) msg('msg_01');
		//else msg('msg_02');
		if ( this.pausemouseover ) {
			this.stop = true;
		}
		for( var i = 0; i < 10; ++i ) {
			var ii = i + 1;
			if( ii < 10 ) ii = "r0" + ii;
			else ii = "r" + ii;
			var itemObj = document.getElementById(ii);
			if( itemObj ) {
				if( i == this.i ) itemObj.style.fontWeight='bold';
				else itemObj.style.fontWeight='normal';
			}
		}
	};
	
	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);
	}
}