鼠标移至小图，自动显示相应大图

实现根据后台绑定小图片，鼠标移至小图，自动显示相应大图

.Net精简版本

<script language="JavaScript">    
   function GetShowImg(imgfile)
   {
    document.all("ShowImage").src = "/semir/images/"+ imgfile;
    
   }      
  </script> 
 //DataList绑定
 <asp:datalist id="DlSides" runat="server" OnItemCommand="DlSides_ItemCommand" RepeatDirection="Horizontal"
      RepeatColumns="3" DataKeyField="SideID" CssClass="semirText">      
      <ItemTemplate>
       <a onmouseover="GetShowImg('<%# DataBinder.Eval(Container.DataItem, "sidePath")%>')"><IMG style="WIDTH: 45px; HEIGHT: 56px" alt="" src='/semir/images/small<%# DataBinder.Eval(Container.DataItem, "sidePath")%>' border=0 ></a>
                </ItemTemplate>
     </asp:datalist>

// 显示相应大图
<img name="ShowImage">

ASP完整版

<script language="JavaScript">
    function ImagePreload()
    {
    var args = ImagePreload.arguments;
    document.ImgPreArray = new Array(args.length);
    for(var i=0; i<args.length; i++)
    {
    document.ImgPreArray[i] = new Image;
    document.ImgPreArray[i].src = "admin/upfile/newbook/"+ args[i];
    }
    }
     function fitSize() {
      var a, b;
      var imgobj = document.all("ShowImage");
      var oldimg = new Image();
      oldimg.src = imgobj.src;
      var dw = oldimg.width;
      var dh = oldimg.height;
      if(imgobj == null) {
       setTimeout("fitSize()", 50);
       return;
      }
      if(imgobj.offsetWidth == 0) {
       setTimeout("fitSize()", 50);
       return;
      }
      var maxW = 300;
      var maxH = 270;
      if(dw>maxW || dh>maxH) {
       a = dw/maxW;
       b = dh/maxW;
       if(b>a) a=b;
       dw = dw/a;
       dh = dh/a;
      }
      if(dw > 0 && dh > 0) {
       imgobj.width = dw;
       imgobj.height = dh;
      }
     }
     function GetShowImg(imgtext, imgfile) {
      document.all("ShowImgText").innerHTML = imgtext;
      document.all("ShowImage").src = "admin/upfile/newbook/"+ imgfile;
      document.all("ShowImage").width = 267;
      document.all("ShowImage").height = 267;
      //fitSize();'show picture size
     }
     function ShowTextDetail(n) {
      for (i=1; i<5; i++) {
       document.all("TextDetail"+i).style.display = "none";
      }
      document.all("TextDetail"+n).style.display = "";
      for (i=1; i<4; i++) {
       document.all("TitleDetail"+i).className = "shopTabOff";
      }
      if (n < 4) {
       document.all("TitleDetail"+n).className = "shopTabOn";
      }
     }
      </script>
      <script language="JavaScript" for="window" event="onload">
     ImagePreload('<%=rs("picture")%>');
      </script>
'---------调用-显示-------
 <%if rs("picture")<>"" then %>
                        <a style="cursor:hand">
                        <img name="ShowImage" src="admin/upfile/newbook/<%=rs("picture")%>" border="0" width="267" height="267">
      <!--  <img name="ShowImage" src="../upimages/F_060524_000613_46398.jpg" border=0 onload="fitSize();"> -->
                        </a> <span id="ShowImgText" style="font-weight: bold;"></span>
                        <% end if %>
‘--------------鼠标移过的图片------
 <% if rs("picture")<>"" then%>
         <a onmouseover="GetShowImg('','<%=rs("picture")%>');">
                              <img name="Image71" src="admin/upfile/newbook/<%=rs("picture")%>" alt="dogo" width="40" height="30" border="0"></a>
                              <%end if%>