客户端脚本调用服务器端动态内容，移动到链接显示预览

aspx页面代码

<script language="javascript" type="text/javascript">
       //图片预览效果
        function ShowPic(url)
        {            
            document.getElementById("picture").style.display="";
            document.getElementById("picture").style.left=event.clientX+5;
            document.getElementById("picture").style.top=event.clientY+5;
            document.getElementById("picture").innerHTML= "<img src='"+url+"' width='200' height='200'/>";
           
       }
       function  ShowVideo(url)
        {   
            document.getElementById("video").style.display="";
            document.getElementById("video").style.left=event.clientX+5;
            document.getElementById("video").style.top=event.clientY+5;
            document.getElementById("video").innerHTML=   "<object id='MediaPlayer' width=300 height=250 classid='CLSID:6BF52A52-394A-11D3-B153-00C04F79FAA6'> <param name='URL' value='"+url+"'><param name='rate' value='1'> <param name='balance' value='0'> <param name='currentPosition' value='0'> <param name='defaultFrame' value> <param name='playCount' value='100'> <param name='autoStart' value='1'> <param name='currentMarker' value='0'> <param name='invokeURLs' value='1'> <param name='baseURL' value> <param name='volume' value='100'> <param name='mute' value='0'> <param name='uiMode' value='full'> <param name='stretchToFit' value='0'> <param name='windowlessVideo' value='0'> <param name='enabled' value='1'> <param name='enableContextMenu' value='1'> <param name='fullScreen' value='0'> <param name='SAMIStyle' value> <param name='SAMILang' value> <param name='SAMIFilename' value> <param name='captioningID' value> <param name='enableErrorDialogs' value='0'>  <param name='_cx' value='7779'> <param name='_cy' value='1693'> </object>";
        }
        function  ShowDivMusic(url)
        {           
            document.getElementById("divMusic").style.display="";
            document.getElementById("divMusic").style.left=event.clientX+5;
            document.getElementById("divMusic").style.top=event.clientY+5;
            document.getElementById("divMusic").innerHTML="<embed id='music' type='video/x-ms-wmv'  align='middle' autostart='true' height='45' width='300' loop='true' src='"+url+"'></embed>";
            }
       function PriveiwTxt(content)
        {            
            document.getElementById("PreTxt").style.display="";
            document.getElementById("PreTxt").style.left=event.clientX+5;
            document.getElementById("PreTxt").style.top=event.clientY+5;
            document.getElementById("PreTxt").style.backgroundColor="white";
            document.getElementById("PreTxt").innerHTML=content;
        }            
        function  DisappearDivMusic()
        {
          document.getElementById("divMusic").style.display="none";
          document.getElementById("music").controls.pause();
          document.clear();
        }

        function  DisappearDivVideo()
        {
          document.getElementById("video").style.display="none";
          document.getElementById("MediaPlayer").controls.stop();
          document.clear();
        }
        function DisappearDivPic()
        {
            document.getElementById("picture").style.display="none";
        }
        function DisppearTxt()
        {
            document.getElementById("PreTxt").style.display="none";
        }
        function Disppear()
        {
            var existPreTxt = document.getElementById("PreTxt");
            var existPicture = document.getElementById("picture");
            var existvideo = document.getElementById("video");
            var existMediaPlayer = document.getElementById("MediaPlayer");
            var existmusic = document.getElementById("divMusic");
            var existtestmusic = document.getElementById("music");
            if(existPreTxt!=null)
                DisppearTxt();
            if(existPicture!=null)
                DisappearDivPic();
            if(existMediaPlayer!=null && existvideo!=null)
                DisappearDivVideo();
            if(existtestmusic!=null && existtestmusic!=null)
                DisappearDivMusic();
        }
        
    </script>
    
  </head>
  
	<body onclick="Disppear()">
  
    <div id="picture" style="display:none; width:200px; height:200px; border-bottom:1px solid #FF0000; border-left:1px solid #FF0000;border-top:1px solid #FF0000;border-right:1px solid #FF0000;position:absolute;">
    </div>
    <div id="video" style="display:none; width:300px; height:45px; border-bottom:1px solid #FF0000; border-left:1px solid #FF0000;border-top:1px solid #FF0000;border-right:1px solid #FF0000;position:absolute;">
    </div> 
    <div id="divMusic" style="display:none; width:300px; height:45px; border-bottom:1px solid #FF0000; border-left:1px solid #FF0000;border-top:1px solid #FF0000;border-right:1px solid #FF0000;position:absolute;">
    </div>
     <div id="PreTxt" style="display:none; width:600px; height:200px; border-bottom:1px solid #FF0000; border-left:1px solid #FF0000;border-top:1px solid #FF0000;border-right:1px solid #FF0000;position:absolute;">
    </div>


cs页面代码

            bool legalPic = false;
            bool legalVideo = false;
            bool legalAudio = false;
            string[] picArray = { "jpg","gif","bmp","pcx","jpeg","png"};
            string[] videoArray = { "rmvb", "flv", "rm", "wmv", "mp4", "avi" };
            string[] audioArray = { "mp3", "wma" };
            foreach (string pic in picArray)
            {
                if (itemKind.Equals(pic))
                    legalPic = true;
            }
            foreach (string video in videoArray)
            {
                if (itemKind.Equals(video))
                    legalVideo = true;
            }
            foreach (string audio in audioArray)
            {
                if (itemKind.Equals(audio))
                    legalAudio = true;
            }
            //图片预览特效
            if (legalPic)
                TitleLB.Attributes.Add("onmouseover", "ShowPic('"+ URL +"')");
            else if (legalVideo)
                TitleLB.Attributes.Add("onmouseover", "ShowVideo('" + URL + "')");
            else if (legalAudio)
                TitleLB.Attributes.Add("onmouseover", "ShowDivMusic('" + URL + "')");
            else if (itemKind.Equals("txt"))
            {
                //创建预览对象
                Preview preivew = new Preview();
                //通过url地址来返回txt文本前五十行内容
                string previewTxt = preivew.txtToText(URL); 
                TitleLB.Attributes.Add("onmouseover", "PriveiwTxt('" +previewTxt + "')");
               // TitleLB.Attributes.Add("onmouseout", "return DisppearTxt()");
            }