javascript实现图片轮换效果

<script type="text/javascript">
/**************************************************   
名称: 图片轮播类      
示例:   
        页面中已经存在名为imgPlayer(或者别的ID也行)的节点.   
        PImgPlayer.addItem( "test", "http://kxgw8.cn", "http://kxgw8.cn/images/wy.jpg");   
        PImgPlayer.addItem( "test2", "http://kxgw8.cn", "http://kxgw8.cn/images/wy.jpg");   
        PImgPlayer.addItem( "test3", "http://kxgw8.cn", "http://kxgw8.cn/images/wy.jpg");   
        PImgPlayer.init( "imgPlayer", 200, 230 );   
备注:   
        适用于一个页面只有一个图片轮播的地方.   
***************************************************/   
var PImgPlayer = {   
        _timer : null,   
        _items : [],   
        _container : null,   
        _index : 0,   
        _imgs : [],   
        intervalTime : 3500,        //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 = "background-color:#385165;opacity: 0.8;margin:0 0 10px 0;width:"+w+"px;position:absolute;z-index:999;right:0px;FILTER:Alpha(Opacity=50,FinishOpacity=50, Style=1);overflow: hidden;bottom:-1px;height:32px; border-right:0px solid #fff;";   
                //   
                var liStyle = "margin:0;list-style-type: none; margin:0;padding:0; float:right;";   
                //   
                var baseSpacStyle = "clear:both; display:block; width:20px;line-height:32px; font-size:10px; FONT-FAMILY:'Verdana';/*opacity: 0.6;*/";   
                baseSpacStyle += "border:0px 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;";   
                                spanStyle = baseSpacStyle + "background:#2573b8;"; 
                                ulHTML += "<span style='height:32px;line-height:32px;color:#fff;font-family:\"黑体\";padding-left:10px;font-weight:bold;'>"+this._items[i].title+"<span>";
                        } else {                                   
                                //spanStyle = baseSpacStyle + "background:#000;"; 
                                spanStyle = baseSpacStyle + "background:#385165;";   
                        }   
                        
                        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:20px;line-height:32px; font-size:10px; FONT-FAMILY:'Verdana';/*opacity: 0.6;*/";   
                baseSpacStyle += "border:0px 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:#2573b8;";   
                                ulHTML += "<span style='height:32px;line-height:32px;color:#fff;font-family:\"黑体\";padding-left:10px;font-weight:bold;'>"+this._items[i].title+"<span>";
                        } else {                                   
                                spanStyle = baseSpacStyle + "background:#385165;";   
                        }   
                        
                        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 = "#2573b8";   
                }   
        },   
        mouseOut : function(obj){   
                obj.style.color = "#fff";   
        }   
}   
</script>
<div style="clear:both; width:695px; margin:0 auto; height:292px; padding-top:0px;border:0px solid red;">
<div id="imgADPlayer">
</div>
<script type="text/javascript" language="javascript">
//<![CDATA[
PImgPlayer.addItem( "作者：老坚", "#", "http://jdm.jimdo.com/s/cc_images/cache_1352548404.jpg");
PImgPlayer.addItem( "作者：老何", "#", "http://jdm.jimdo.com/s/cc_images/cache_1352548504.jpg");
PImgPlayer.addItem( "作者：老张", "#", "http://jdm.jimdo.com/s/cc_images/cache_1352548604.jpg");
PImgPlayer.addItem( "作者：老李", "#", "http://jdm.jimdo.com/s/cc_images/cache_1352548704.jpg");
PImgPlayer.addItem( "作者：老白", "#", "http://jdm.jimdo.com/s/cc_images/cache_1352548804.jpg");

PImgPlayer.init( "imgADPlayer", 443, 292 );
//]]>
</script>
</div>