Mejora de codigo

[thi]

Hola a todos,

me gustaría mejorar el codigo de abajo para que las imagenes aparezcan deslizandose desde arriba hacia abajo.

Codigo:
<script language="JavaScript1.2">

/***********************************************
* Flexi Slideshow- © Dynamic Drive (www.dynamicdrive.com)
* This notice must stay intact for use
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

var variableslide=new Array()

//variableslide[x]=["path to image", "OPTIONAL link for image", "OPTIONAL text description (supports HTML tags)"]

<?php
defined( '_VALID_MOS' ) or die( 'Restricted access' );
//datos de la conexion a la base de datos
require('conexion.php');

$query = "SELECT Imagen_oferta FROM Ofertas WHERE premium>0";

$result = mysql_query($query);
$i=0;
while ($row = mysql_fetch_array($result,MYSQL_ASSOC))
{?>
variableslide[<?php echo $i; ?>]=['<?php echo "images/ofertas/".$row['Imagen_oferta']; ?>', 'index.php?option=com_content&view=article&id=77', '']

variableslide.sort(function(){return Math.round(Math.random()) - .5;});

<?php
$i++;
}
?>

//configure the below 3 variables to set the dimension/background color of the slideshow

var slidewidth='600px' //set to width of LARGEST image in your slideshow
var slideheight='830px' //set to height of LARGEST iamge in your slideshow, plus any text description
var slidebgcolor='#cccccc' //f3f3f3

//configure the below variable to determine the delay between image rotations (in miliseconds)
var slidedelay=5000

////Do not edit pass this line////////////////

var ie=document.all
var dom=document.getElementById

for (i=0;i<variableslide.length;i++){
var cacheimage=new Image()
cacheimage.src=variableslide[i][0]
}

var currentslide=0

function rotateimages(){
contentcontainer='<left>'
if (variableslide[currentslide][1]!="")
contentcontainer+='<a href="'+variableslide[currentslide][1]+'">'
contentcontainer+='<img src="'+variableslide[currentslide][0]+'" border="0" vspace="3" width="585" height="827">'
if (variableslide[currentslide][1]!="")
contentcontainer+='</a>'
contentcontainer+='</left>'
if (variableslide[currentslide][2]!="")
contentcontainer+=variableslide[currentslide][2]

if (document.layers){
crossrotateobj.document.write(contentcontainer)
crossrotateobj.document.close()
}
else if (ie||dom)
crossrotateobj.innerHTML=contentcontainer
if (currentslide==variableslide.length-1) currentslide=0
else currentslide++
setTimeout("rotateimages()",slidedelay)
}

if (ie||dom)
document.write('<div id="slidedom" style="width:'+slidewidth+';height:'+slideheight+' ; background-color:'+slidebgcolor+'"></div>')

function start_slider(){
crossrotateobj=dom? document.getElementById("slidedom") : ie? document.all.slidedom : document.slidensmain.document.slidenssub
if (document.layers)
document.slidensmain.visibility="show"
rotateimages()
}

if (ie||dom)
start_slider()
else if (document.layers)
window.onload=start_slider

</script>

Un saludo.