js轮播

var PImgPlayer = {
    _timer : null,
    _items : [],
    _container : null,
    _index : 0,
    _imgs : [],
    intervalTime : 5000,    //轮播间隔时间
    init : function( objID, w, h, time ){
        this.intervalTime = time || this.intervalTime;
        this._container = document.getElementById( objID );
        this._container.style.display = "block";
        this._container.style.width = w + "px";
        this._container.style.height = h + "px";
        this._container.style.position = "relative";
        this._container.style.overflow  = "hidden";
        //this._container.style.border = "1px solid #fff";
        var linkStyle = "display: block; TEXT-DECORATION: none;";
        if( document.all ){
            linkStyle += "FILTER:";
            linkStyle += "progid:DXImageTransform.Microsoft.Barn(duration=0.5, motion='out', orientation='vertical') ";
            linkStyle += "progid:DXImageTransform.Microsoft.Barn ( duration=0.5,motion='out',orientation='horizontal') ";
            linkStyle += "progid:DXImageTransform.Microsoft.Blinds ( duration=0.5,bands=10,Direction='down' )";
            linkStyle += "progid:DXImageTransform.Microsoft.CheckerBoard()";
            linkStyle += "progid:DXImageTransform.Microsoft.Fade(duration=0.5,overlap=0)";
            linkStyle += "progid:DXImageTransform.Microsoft.GradientWipe ( duration=1,gradientSize=1.0,motion='reverse' )";
            linkStyle += "progid:DXImageTransform.Microsoft.Inset ()";
            linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=PLUS,motion=out )";
            linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=PLUS,motion=in )";
            linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=DIAMOND,motion=in )";
            linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=SQUARE,motion=in )";
            linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=0.5,irisStyle=STAR,motion=in )";
            linkStyle += "progid:DXImageTransform.Microsoft.RadialWipe ( duration=0.5,wipeStyle=CLOCK )";
            linkStyle += "progid:DXImageTransform.Microsoft.RadialWipe ( duration=0.5,wipeStyle=WEDGE )";
            linkStyle += "progid:DXImageTransform.Microsoft.RandomBars ( duration=0.5,orientation=horizontal )";
            linkStyle += "progid:DXImageTransform.Microsoft.RandomBars ( duration=0.5,orientation=vertical )";
            linkStyle += "progid:DXImageTransform.Microsoft.RandomDissolve ()";
            linkStyle += "progid:DXImageTransform.Microsoft.Spiral ( duration=0.5,gridSizeX=16,gridSizeY=16 )";
            linkStyle += "progid:DXImageTransform.Microsoft.Stretch ( duration=0.5,stretchStyle=PUSH )";
            linkStyle += "progid:DXImageTransform.Microsoft.Strips ( duration=0.5,motion=rightdown )";
            linkStyle += "progid:DXImageTransform.Microsoft.Wheel ( duration=0.5,spokes=8 )";
            linkStyle += "progid:DXImageTransform.Microsoft.Zigzag ( duration=0.5,gridSizeX=4,gridSizeY=40 ); width: 100%; height: 100%";
        }
        //
        var ulStyle = "margin:0;width:"+w+"px;position:absolute;z-index:999;right:5px;FILTER:Alpha(Opacity=30,FinishOpacity=90, Style=1);overflow: hidden;bottom:-1px;height:16px; border-right:1px solid #fff;";
        //
        var liStyle = "margin:0;list-style-type: none; margin:0;padding:0; float:right;";
        //
        var baseSpacStyle = "clear:both; display:block; width:23px;line-height:18px; font-size:12px; FONT-FAMILY:'宋体';opacity: 0.6;";
        baseSpacStyle += "border:1px solid #fff;border-right:0;border-bottom:0;";
        baseSpacStyle += "color:#fff;text-align:center; cursor:pointer; ";
        //
        var ulHTML = "";
        for(var i = this._items.length -1; i >= 0; i--){
            var spanStyle = "";
            if( i==this._index ){
                spanStyle = baseSpacStyle + "background:#ff0000;";
            } else {                
                spanStyle = baseSpacStyle + "background:#000;";
            }
            ulHTML += "<li style=\""+liStyle+"\">";
            ulHTML += "<span onmouseover=\"PImgPlayer.mouseOver(this);\" onmouseout=\"PImgPlayer.mouseOut(this);\" style=\""+spanStyle+"\" onclick=\"PImgPlayer.play("+i+");return false;\" herf=\"javascript:;\" title=\"" + this._items[i].title + "\">" + (i+1) + "</span>";
            ulHTML += "</li>";
        }
        //
        var html = "<a href=\""+this._items[this._index].link+"\" title=\""+this._items[this._index].title+"\" target=\"_blank\" style=\""+linkStyle+"\"></a><ul style=\""+ulStyle+"\">"+ulHTML+"</ul>";
        this._container.innerHTML = html;
        var link = this._container.getElementsByTagName("A")[0];    
        link.style.width =  w + "px";
        link.style.height = h + "px";
        link.style.background = 'url(' + this._items[0].img + ') no-repeat center center';
        //
        this._timer = setInterval( "PImgPlayer.play()", this.intervalTime );
    },
    addItem : function( _title, _link, _imgURL ){
        this._items.push ( {title:_title, link:_link, img:_imgURL } );
        var img = new Image();
        img.src = _imgURL;
        this._imgs.push( img );
    },
    play : function( index ){
        if( index!=null ){
            this._index = index;
            clearInterval( this._timer );
            this._timer = setInterval( "PImgPlayer.play()", this.intervalTime );
        } else {
            this._index = this._index<this._items.length-1 ? this._index+1 : 0;
        }
        var link = this._container.getElementsByTagName("A")[0];    
        if(link.filters){
            var ren = Math.floor(Math.random()*(link.filters.length));
            link.filters[ren].Apply();
            link.filters[ren].play();
        }
        link.href = this._items[this._index].link;
        link.title = this._items[this._index].title;
        link.style.background = 'url(' + this._items[this._index].img + ') no-repeat center center';
        //
        var liStyle = "margin:0;list-style-type: none; margin:0;padding:0; float:right;";
        var baseSpacStyle = "clear:both; display:block; width:23px;line-height:18px; font-size:12px; FONT-FAMILY:'宋体'; opacity: 0.6;";
        baseSpacStyle += "border:1px solid #fff;border-right:0;border-bottom:0;";
        baseSpacStyle += "color:#fff;text-align:center; cursor:pointer; ";
        var ulHTML = "";
        for(var i = this._items.length -1; i >= 0; i--){
            var spanStyle = "";
            if( i==this._index ){
                spanStyle = baseSpacStyle + "background:#ff0000;";
            } else {                
                spanStyle = baseSpacStyle + "background:#000;";
            }
            ulHTML += "<li style=\""+liStyle+"\">";
            ulHTML += "<span onmouseover=\"PImgPlayer.mouseOver(this);\" onmouseout=\"PImgPlayer.mouseOut(this);\" style=\""+spanStyle+"\" onclick=\"PImgPlayer.play("+i+");return false;\" herf=\"javascript:;\" title=\"" + this._items[i].title + "\">" + (i+1) + "</span>";
            ulHTML += "</li>";
        }
        this._container.getElementsByTagName("UL")[0].innerHTML = ulHTML;    
    },
    mouseOver : function(obj){
        var i = parseInt( obj.innerHTML );
        if( this._index!=i-1){
            obj.style.color = "#ff0000";
        }
    },
    mouseOut : function(obj){
        obj.style.color = "#fff";
    }
}