實現首頁圖片輪播的方法

<script><!--
function Marquee()
{
this.ID = document.getElementById(arguments[0]);
if(!this.ID)
{
   alert("您要設置的/"" + arguments[0] + "/"初始化錯誤/r/n請檢查標籤ID設置是否正確!");
   this.ID = -1;
   return;
}
this.Direction = this.Width = this.Height = this.DelayTime = this.WaitTime = this.CTL = this.StartID = this.Stop = this.MouseOver = 0;
this.Step = 1;
this.Timer = 30;
this.DirectionArray = {"top":0 , "up":0 , "bottom":1 , "down":1 , "left":2 , "right":3};
if(typeof arguments[1] == "number" || typeof arguments[1] == "string")this.Direction = arguments[1];
if(typeof arguments[2] == "number")this.Step = arguments[2];
if(typeof arguments[3] == "number")this.Width = arguments[3];
if(typeof arguments[4] == "number")this.Height = arguments[4];
if(typeof arguments[5] == "number")this.Timer = arguments[5];
if(typeof arguments[6] == "number")this.DelayTime = arguments[6];
if(typeof arguments[7] == "number")this.WaitTime = arguments[7];
if(typeof arguments[8] == "number")this.ScrollStep = arguments[8];
this.ID.style.overflow = this.ID.style.overflowX = this.ID.style.overflowY = "hidden";
this.ID.noWrap = true;
this.IsNotOpera = (navigator.userAgent.toLowerCase().indexOf("opera") == -1);
if(arguments.length >= 7)this.Start();
}
 
Marquee.prototype.Start = function()
{
if(this.ID == -1)return;
if(this.WaitTime < 800)this.WaitTime = 800;
if(this.Timer < 20)this.Timer = 20;
if(this.Width == 0)this.Width = parseInt(this.ID.style.width);
if(this.Height == 0)this.Height = parseInt(this.ID.style.height);
if(typeof this.Direction == "string")this.Direction = this.DirectionArray[this.Direction.toString().toLowerCase()];
this.HalfWidth = Math.round(this.Width / 2);
this.HalfHeight = Math.round(this.Height / 2);
this.BakStep = this.Step;
this.ID.style.width = this.Width + "px";
this.ID.style.height = this.Height + "px";
if(typeof this.ScrollStep != "number")this.ScrollStep = this.Direction > 1 ? this.Width : this.Height;
var templateLeft = "<table cellspacing='0' cellpadding='0' style='border-collapse:collapse;display:inline;'><tr><td noWrap=true style='white-space: nowrap;word-break:keep-all;'>MSCLASS_TEMP_HTML</td><td noWrap=true style='white-space: nowrap;word-break:keep-all;'>MSCLASS_TEMP_HTML</td></tr></table>";
var templateTop = "<table cellspacing='0' cellpadding='0' style='border-collapse:collapse;'><tr><td>MSCLASS_TEMP_HTML</td></tr><tr><td>MSCLASS_TEMP_HTML</td></tr></table>";
var msobj = this;
msobj.tempHTML = msobj.ID.innerHTML;
if(msobj.Direction <= 1)
{
   msobj.ID.innerHTML = templateTop.replace(/MSCLASS_TEMP_HTML/g,msobj.ID.innerHTML);
}
else
{
   if(msobj.ScrollStep == 0 && msobj.DelayTime == 0)
   {
    msobj.ID.innerHTML += msobj.ID.innerHTML;
   }
   else
   {
    msobj.ID.innerHTML = templateLeft.replace(/MSCLASS_TEMP_HTML/g,msobj.ID.innerHTML);
   }
}
var timer = this.Timer;
var delaytime = this.DelayTime;
var waittime = this.WaitTime;
msobj.StartID = function(){msobj.Scroll()}
msobj.Continue = function()
     {
      if(msobj.MouseOver == 1)
      {
       setTimeout(msobj.Continue,delaytime);
      }
      else
      { clearInterval(msobj.TimerID);
       msobj.CTL = msobj.Stop = 0;
       msobj.TimerID = setInterval(msobj.StartID,timer);
      }
     }
 
msobj.Pause = function()
    {
     msobj.Stop = 1;
     clearInterval(msobj.TimerID);
     setTimeout(msobj.Continue,delaytime);
    }
 
msobj.Begin = function()
   {
    msobj.ClientScroll = msobj.Direction > 1 ? msobj.ID.scrollWidth / 2 : msobj.ID.scrollHeight / 2;
    if((msobj.Direction <= 1 && msobj.ClientScroll <= msobj.Height + msobj.Step) || (msobj.Direction > 1 && msobj.ClientScroll <= msobj.Width + msobj.Step))    {
     msobj.ID.innerHTML = msobj.tempHTML;
     delete(msobj.tempHTML);
     return;
    }
    delete(msobj.tempHTML);
    msobj.TimerID = setInterval(msobj.StartID,timer);
    if(msobj.ScrollStep < 0)return;
    msobj.ID.onmousemove = function(event)
       {
        if(msobj.ScrollStep == 0 && msobj.Direction > 1)
        {
         var event = event || window.event;
         if(window.event)
         {
          if(msobj.IsNotOpera)
          {
           msobj.EventLeft = event.srcElement.id == msobj.ID.id ? event.offsetX - msobj.ID.scrollLeft : event.srcElement.offsetLeft - msobj.ID.scrollLeft + event.offsetX;
          }
          else
          {
           msobj.ScrollStep = null;
           return;
          }
         }
         else
         {
          msobj.EventLeft = event.layerX - msobj.ID.scrollLeft;
         }
         msobj.Direction = msobj.EventLeft > msobj.HalfWidth ? 3 : 2;
         msobj.AbsCenter = Math.abs(msobj.HalfWidth - msobj.EventLeft);
         msobj.Step = Math.round(msobj.AbsCenter * (msobj.BakStep*2) / msobj.HalfWidth);
        }
       }
    msobj.ID.onmouseover = function()
       {
        if(msobj.ScrollStep == 0)return;
        msobj.MouseOver = 1;
        clearInterval(msobj.TimerID);
       }
    msobj.ID.onmouseout = function()
       {
        if(msobj.ScrollStep == 0)
        {
         if(msobj.Step == 0)msobj.Step = 1;
         return;
        }
        msobj.MouseOver = 0;
        if(msobj.Stop == 0)
        {
         clearInterval(msobj.TimerID);
         msobj.TimerID = setInterval(msobj.StartID,timer);
        }
       }
   }
setTimeout(msobj.Begin,waittime);
}
 
Marquee.prototype.Scroll = function()
{
switch(this.Direction)
{
   case 0:
    this.CTL += this.Step;
    if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
    {
     this.ID.scrollTop += this.ScrollStep + this.Step - this.CTL;
     this.Pause();
     return;
    }
    else
    {
     if(this.ID.scrollTop >= this.ClientScroll)
     {
      this.ID.scrollTop -= this.ClientScroll;
     }
     this.ID.scrollTop += this.Step;
    }
   break;
 
   case 1:
    this.CTL += this.Step;
    if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
    {
     this.ID.scrollTop -= this.ScrollStep + this.Step - this.CTL;
     this.Pause();
     return;
    }
    else
    {
     if(this.ID.scrollTop <= 0)
     {
      this.ID.scrollTop += this.ClientScroll;
     }
     this.ID.scrollTop -= this.Step;
    }
   break;
 
   case 2:
    this.CTL += this.Step;
    if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
    {
     this.ID.scrollLeft += this.ScrollStep + this.Step - this.CTL;
     this.Pause();
     return;
    }
    else
    {
     if(this.ID.scrollLeft >= this.ClientScroll)
     {
      this.ID.scrollLeft -= this.ClientScroll;
     }
     this.ID.scrollLeft += this.Step;
    }
   break;
 
   case 3:
    this.CTL += this.Step;
    if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
    {
     this.ID.scrollLeft -= this.ScrollStep + this.Step - this.CTL;
     this.Pause();
     return;
    }
    else
    {
     if(this.ID.scrollLeft <= 0)
     {
      this.ID.scrollLeft += this.ClientScroll;
     }
     this.ID.scrollLeft -= this.Step;
    }
   break;
}
}
//--></script>

 <table width="989" height="275" border="0" cellspacing="0" cellpadding="0" align="center">
  <tr>
   <td><div id="marquee" style="OVERFLOW: auto; WIDTH: 100%; HEIGHT: 275px">
     <table width="989" border="0" cellpadding="0" cellspacing="0">
      <tr>
       <td align="center" height="275"><img src="images/tu1.jpg"></td>
      </tr>
      <tr>
       <td align="center" height="275"><img src="images/tu2.jpg"></td>
      </tr>
      <tr>
       <td align="center" height="275"><img src="images/tu1.jpg"></td>
      </tr>
      <tr>
       <td align="center" height="275"><img src="images/tu2.jpg"></td>
      </tr>
     </table>
    </div>
    <SCRIPT defer>
var marquee1 = new Marquee("marquee")
   marquee1.Direction = "top";
   marquee1.Step = 15;
   marquee1.Width = 989;
   marquee1.Height = 275;
   marquee1.Timer = 20;
   marquee1.DelayTime = 5000;
   marquee1.WaitTime = 5000;
   marquee1.ScrollStep = 275;
   marquee1.Start();
    </SCRIPT>
   </td>
  </tr>
 </table>