我想让它上下翻动

Question

<script language=JavaScript>
function HelpArray2(len) 
{
this.length=len;
}HelpText2  = new HelpArray2(3);
HelpText2[0] ="images/g_gao.jpg";HelpText2[1] ="images/g_gao2.jpg";HelpText2[2] ="images/g_gao3.jpg";ScriptText2 = new HelpArray2(3);var i = 0;
function playHelp()
{
if (i == 2)  
  {  i = 0; } 
else
  {  i++; } div_X2.filters[0].apply(); 
div_X2.children[0].src = HelpText2[i]; 
div_X2.filters[0].play();   
mytimeout = setTimeout('playHelp()',4500);}var mytimeout;                                                </script>
<span id=div_X2 style="FILTER: progid:DXImageTransform.Microsoft.GradientWipe(duration=2, gradientsize=0.25,motion=forward,WipeStyle=1 ); WIDTH=240"> <img src="javascript:playHelp()" border=0></span>