var ERROR_CONTAINERNOTFOUND = "父容器未找到";
var ERROR_JSCOMMAND = "Js";
var MarqueeCount = 0;
var MarqueeCollection = new Array();
var MarqueeBarNoMsg = "ʱϢ";
var MarqueeDefaultSleepTime = 2000;

function MarqueeBar(srcParElem,barWidth,barHeight,sleepTime,scrollDir,halign,valign)
{
        this.mID;
        this.container = srcParElem;
        this.width  = barWidth;
        this.height = barHeight;
        this.sleepTime = (sleepTime == undefined)? MarqueeDefaultSleepTime : Math.abs(sleepTime);;
        this.hAlign    = (halign == undefined)? "LEFT" : halign;
        this.vAlign    = (valign == undefined)? "MIDDLE" : valign;
        this.direction = (scrollDir == undefined||(scrollDir != MarqueeBar.H && scrollDir != MarqueeBar.V))? MarqueeBar.H : scrollDir;
        this.marqueeBar   = null;
        this.msgContainer = null;
        this.templateRow  = null;
        this.status       = -1;
        this.frameCount   = 10;
        this.scrollDelay  = 50;
        this.msgQueue     = [];
        this.step;
        this.setTm            
        this.init = function()
        {
                if(typeof this.container == "string")
                {
                        this.container = document.getElementById(this.container);
                }
                if(this.container == undefined)
                {
                        alert("Error: " + ERROR_CONTAINERNOTFOUND);
                        return -1;
                }

                this.setFrameCount(this.frameCount);

                this.marqueeBar = document.createElement("DIV");
                with(this.marqueeBar)
                {
                        style.top  = "0px";
                        style.left = "0px";
                        style.width  = this.width + "px";
                        style.height = this.height + "px";
                        style.overflow = "hidden";
                        style.position = "relative";
                }
                if(this.container.style.position == "block" || 
                        this.container.style.position == "")
                {
                        this.container.style.position = "relative";
                }
                this.style = this.marqueeBar.style;
                this.container.appendChild(this.marqueeBar);

                this.msgContainer  = document.createElement("TABLE");
                with(this.msgContainer)
                {        
                        cellPadding = 0;
                        cellSpacing = 0;
                        style.top   = 0;
                        style.left  = 0;
                        style.width       = "100%";
                        style.position    = "relative";
                        style.overflowX   = "hidden";
                        style.tableLayout = "fixed";
                }
                this.marqueeBar.appendChild(this.msgContainer);        
                var msgTemp = this.msgContainer.insertRow(0).insertCell(0);
                this.setStyle(msgTemp);

                MarqueeCollection[(this.mID = MarqueeCount++)] = this;        
        }
        this.add = function(label,link)
        {
                this.msgQueue.push(new Array(label,link));
        }
        this.start = function()
        {
                if(this.status > 0 && this.start.caller != MarqueeBar ||
                         this.container == undefined)
                {
                        return;
                }
                if(this.status == 0)
                {
                        this.restart();
                        return;
                }
                this.status = 1;
                this.run();        
        }
        this.run = function()
        {
                if(this.status == 0)
                {  
                        return;        
                }        
                //ϢΪ0ת,ȴǷϢ;
                if(this.msgQueue.length == 0)
                { 
                        this.msgContainer.rows[0].cells[0].innerHTML = MarqueeBarNoMsg;
                        this.msgContainer.rows[0].cells[0].reflectClass = this;
                        this.sleep();
                        return;                
                }
                Js.removeListener(this.msgContainer.rows[0].cells[0],"mouseover",MarqueeBar.pause,false);
                Js.removeListener(this.msgContainer.rows[0].cells[0],"mouseout",MarqueeBar.restart,false);
                var newMsg = (this.direction == MarqueeBar.H)? this.msgContainer.insertRow(1).insertCell(0) : this.msgContainer.rows[0].insertCell(1);
                newMsg.reflectClass = this;
                newMsg.innerHTML = "<SPAN style='width:100%;' onclick=Javascript:{try{eval(\"" + this.msgQueue[0][1] + "\");}catch(ex){alert(\":\"+ex.description);}} style='cursor:hand'>"
                                        + this.msgQueue[0][0] 
                                        + "</SPAN>";
                this.setStyle(newMsg);        
                this.move();        
        }
        this.move = function()
        {        
                if(this.status == 0)
                {   
                        return;
                }
                if(this.direction == MarqueeBar.H)
                {
                        if(Math.abs(this.msgContainer.offsetTop - this.step) < this.height)
                        {        
                                this.msgContainer.style.top = this.msgContainer.offsetTop - this.step;
                                setTimeout("MarqueeCollection["+this.mID+"].move()",this.scrollDelay);
                        }
                        else
                        {       
                                this.msgContainer.deleteRow(0);
                                this.msgContainer.style.top = 0;
                                this.msgQueue.push(this.msgQueue.shift());
                                if(this.status == 1)
                                this.sleep();
                        }
                }
                else if(this.direction == MarqueeBar.V)
                {
                        if(Math.abs(this.msgContainer.offsetLeft - this.step) < this.width)
                        {
                                this.msgContainer.style.left = this.msgContainer.offsetLeft - this.step;
                                setTimeout("MarqueeCollection["+this.mID+"].move()",this.scrollDelay);
                        }
                        else
                        {       
                                this.msgContainer.rows[0].deleteCell(0);
                                this.msgContainer.style.left = 0;
                                this.msgQueue.push(this.msgQueue.shift());
                                if(this.status == 1)
                                this.sleep();
                        }
                }        
        }
        this.sleep = function()
        {        
                Js.addListener(this.msgContainer.rows[0].cells[0],"mouseover",MarqueeBar.pause,false);
                Js.addListener(this.msgContainer.rows[0].cells[0],"mouseout",MarqueeBar.restart,false);

                if(this.sleep.caller == null)
                {        
                        return;
                }
                this.setTm = setTimeout("MarqueeCollection["+this.mID+"].run()",this.sleepTime);        
        }

        this.pause = function()
        {   
                clearTimeout(this.setTm);                
                this.status = 0;
        }
        this.restart = function()
        {
                if(this.status == 1)
                {
                        return;
                }
                this.setTm = setTimeout("MarqueeCollection["+this.mID+"].run()",this.sleepTime);
                this.status = 1;
        }
        this.setStyle = function(obj)
        {
                obj.style.overflow = "hidden";
                obj.style.width = this.width + "px";
                obj.style.height = this.height + "px";
                obj.style.font = "12px Verdana";

                try
                {        obj.align = this.hAlign;        }
                catch(ex)
                {        obj.align = "LEFT";        }
                try
                {        obj.parentNode.vAlign = this.vAlign;        }
                catch(ex)
                {        obj.parentNode.vAlign = "MIDDLE";        }
        }
        this.setSleepTime = function(t)
        {
                this.sleepTime = Math.abs(t);
        }
        this.setFrameCount = function(n)
        {
                this.frameCount = Math.abs(n);
                this.step = Math.floor(((this.direction == MarqueeBar.H)? this.height : this.width) / this.frameCount);
                if(this.step == 0)this.step = 1;
        }
        this.setScrollDelay = function(n)
        {
                this.scrollDelay = Math.abs(n);
        }
        this.setHAlign = function(halign)
        {
                this.hAlign = halign;
        }

        this.setVAlign = function(valign)
        {
                this.vAlign = valign;
        }

        this.setBackground = function(bgStyle)
        {
                this.marqueeBar.style.background = bgStyle;
        }
        this.setBorder = function(borderStyle)
        {
                this.marqueeBar.style.border = borderStyle;
        }

        this.init();
}

MarqueeBar.H = MarqueeBar.h = "HORIZONTAL";
MarqueeBar.V = MarqueeBar.v = "VERTICAL";

MarqueeBar.pause = function()
{
        var srcElement = Js.getSrcElement(arguments[0]);
        while(srcElement.parentNode != null && srcElement.reflectClass == null)
        {
                srcElement = srcElement.parentNode;
        }
        if(srcElement.reflectClass != undefined)
        {
                srcElement.reflectClass.pause();
        }
}

MarqueeBar.restart = function()
{
        var srcElement = Js.getSrcElement(arguments[0]);
        while(srcElement.parentNode != null &&         srcElement.reflectClass == null)
        {
                srcElement = srcElement.parentNode;
        }
        if(srcElement.tagName == "TD")
        {
                srcElement.reflectClass.restart();
        }        
}

function Js(){}

Js.getSrcElement = function(e)
{
        return (e.target == null)? e.srcElement: e.target;
}

Js.addListener = function(srcObj,evt,dstFunc,flag)
{
        if(srcObj.attachEvent)
        {
                srcObj.attachEvent("on"+evt,dstFunc);
        }
        else if(srcObj.addEventListener)
        {
                srcObj.addEventListener(evt,dstFunc,flag);
        }
}

Js.removeListener = function(srcObj,evt,dstFunc,flag)
{
        if(srcObj.attachEvent)
        {
                srcObj.detachEvent("on"+evt,dstFunc);
        }
        else if(srcObj.removeEventListener)
        {
                srcObj.removeEventListener(evt,dstFunc,flag);
        }
}