Te paso un script que hace lo que pides, eso sí no consigo hacer que se pare después de un cierto número de pasadas
<HTML>
<HEAD>
<TITLE>Banner que rota imágenes</TITLE>
</HEAD>
<BODY>
<table width="100%" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td class="web_bg"> </td>
<td bgcolor="#CCCCCC" width="1"></td>
<td width="325">
<div align="left">
<a href="">
<img src="imagenes/logo.gif" width="321" height="60" border="0"></div>
</td>
<td width="450">
<div align="right"><script language="JavaScript1.2">
//Specify the slider's width (in pixels)
var sliderwidth=450
//Specify the slider's height
var sliderheight=60
//Specify the slider's slide speed (larger is faster 1-10)
var slidespeed=2
//Specify the slider's images
var leftrightslide=new Array()
var finalslide=''
slidebgcolor="#FFFFFF"
leftrightslide[0]='<a href="tuenlace1.html"><img src="imagenes/image1.jpg" border=0></a>'
leftrightslide[1]='<a href="tuenlace2.html"><img src="imagenes/image2.jpg" border=0></a>'
leftrightslide[2]='<a href="tuenlace3.html"><img src="imagenes/image3.jpg" border=0></a>'
leftrightslide[3]='<a href="tuenlace4.html"><img src="imagenes/image4.jpg" border=0></a>'
leftrightslide[4]='<a href="tuenlace5.html"><img src="imagenes/image5.jpg" border=0></a>'
leftrightslide[5]='<a href="tuenlace6.html"><img src="imagenes/image6.jpg" border=0></a>'
var copyspeed=slidespeed
leftrightslide='<nobr>'+leftrightslide.join(" ")+'</nobr>'
var iedom=document.all||document.getElementById
if (iedom)
document.write('<span id="temp"
style="visibility:hidden;position:absolute;top:-100;left:-3000">'+leftrightslide+'</span>')
var actualwidth=''
var cross_slide, ns_slide
function fillup(){
if (iedom){
cross_slide=document.getElementById? document.getElementById("test2") : document.all.test2
cross_slide2=document.getElementById? document.getElementById("test3") : document.all.test3
cross_slide.innerHTML=cross_slide2.innerHTML=leftr ightslide
actualwidth=document.all? cross_slide.offsetWidth : document.getElementById("temp").offsetWidth
cross_slide2.style.left=actualwidth+4
}
else if (document.layers){
ns_slide=document.ns_slidemenu.document.ns_slideme nu2
ns_slide2=document.ns_slidemenu.document.ns_slidem enu3
ns_slide.document.write(leftrightslide)
ns_slide.document.close()
actualwidth=ns_slide.document.width
ns_slide2.left=actualwidth+20
ns_slide2.document.write(leftrightslide)
ns_slide2.document.close()
}
lefttime=setInterval("slideleft()",30)
}
window.onload=fillup
function slideleft(){
if (iedom){
if (parseInt(cross_slide.style.left)>(actualwidth*(-1)+8))
cross_slide.style.left=parseInt(cross_slide.style. left)-copyspeed
else
cross_slide.style.left=parseInt(cross_slide2.style .left)+actualwidth+3
if (parseInt(cross_slide2.style.left)>(actualwidth*(-1)+8))
cross_slide2.style.left=parseInt(cross_slide2.styl e.left)-copyspeed
else
cross_slide2.style.left=parseInt(cross_slide.style .left)+actualwidth+3
}
else if (document.layers){
if (ns_slide.left>(actualwidth*(-1)+8))
ns_slide.left-=copyspeed
else
ns_slide.left=ns_slide2.left+actualwidth+3
if (ns_slide2.left>(actualwidth*(-1)+8))
ns_slide2.left-=copyspeed
else
ns_slide2.left=ns_slide.left+actualwidth+3
}
}
if (iedom||document.layers){
with (document){
document.write('<table border="0" cellspacing="0" cellpadding="0"><td>')
if (iedom){
write('<div style="position:relative;width:'+sliderwidth+';hei ght:'+sliderheight+';overflow:hidden">')
write('<div
style="position:absolute;width:'+sliderwidth+';hei ght:'+sliderheight+';background-color:'+slidebgcolor+'"
onMouseover="copyspeed=0" onMouseout="copyspeed=slidespeed">')
write('<div id="test2" style="position:absolute;left:0;top:0"></div>')
write('<div id="test3" style="position:absolute;left:-1000;top:0"></div>')
write('</div></div>')
}
else if (document.layers){
write('<ilayer width='+sliderwidth+' height='+sliderheight+' name="ns_slidemenu"
bgColor='+slidebgcolor+'>')
write('<layer name="ns_slidemenu2" left=0 top=0 onMouseover="copyspeed=0"
onMouseout="copyspeed=slidespeed"></layer>')
write('<layer name="ns_slidemenu3" left=0 top=0 onMouseover="copyspeed=0"
onMouseout="copyspeed=slidespeed"></layer>')
write('</ilayer>')
}
document.write('</td></table>')
}
}
</script></div>
</td>
<td class="web_bg"> </td>
</tr>
</table>
</BODY>
</HTML>