1.-----------------------------------------------------------------------
copy this swap image Javascript after 
<title>################</title>

---------------------------------

<script type="text/javascript">
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->
</script>


2.-----------------------------------------------------------------------

inside the <body> add the preload function.
<body onload="MM_preloadImages('pic/hm_11_01.jpg','pic/hm_12_01.jpg')">

depend on how many event you have, you might want to add more preloaded images.

3.-----------------------------------------------------------------------

add those into the <body>

<img src="pic/hm_11.jpg" name="Image1" width="156" height="455" border="0" 
id="Image1" 
onmouseover="MM_swapImage('Image1','','pic/hm_11_01.jpg',1)" 
onmouseout="MM_swapImgRestore()" />

<img src="pic/hm_12.jpg" name="Image2" width="138" height="455" border="0" 
id="Image2" 
onmouseover="MM_swapImage('Image2','','pic/hm_12_01.jpg',1)" 
onmouseout="MM_swapImgRestore()" />

4.-----------------------------------------------------------------------

If you want to add hyperlinks to those pictures, wrap <a href="#"> </a> tag 
around those pictures codes.


<a href="#">
<img src="pic/hm_11.jpg" name="Image1" width="156" height="455" border="0" 
id="Image1" 
onmouseover="MM_swapImage('Image1','','pic/hm_11_01.jpg',1)" 
onmouseout="MM_swapImgRestore()" />
</a>

<a href="#">
<img src="pic/hm_12.jpg" name="Image2" width="138" height="455" border="0" 
id="Image2" 
onmouseover="MM_swapImage('Image2','','pic/hm_12_01.jpg',1)" 
onmouseout="MM_swapImgRestore()" />
</a>

4.-----------------------------------------------------------------------

full half done html code:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>javascript 01</title>

<script type="text/javascript">
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->
</script>
<style type="text/css">
<!--
body {
	background-color: #0E284B;
}
-->
</style></head>

<body onload="MM_preloadImages('pic/hm_11_01.jpg','pic/hm_12_01.jpg')">
<p>&nbsp;</p>
<table width="734" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td><a href="http://www.google.com" target="_blank"><img src="pic/hm_11.jpg" name="Image1" width="156" height="455" border="0" id="Image1" onmouseover="MM_swapImage('Image1','','pic/hm_11_01.jpg',1)" onmouseout="MM_swapImgRestore()" /></a></td>
    <td><a href="#"><img src="pic/hm_12.jpg" name="Image2" width="138" height="455" border="0" id="Image2" onmouseover="MM_swapImage('Image2','','pic/hm_12_01.jpg',1)" onmouseout="MM_swapImgRestore()" /></a></td>
    <td><img src="pic/hm_13.jpg" width="148" height="455" /></td>
    <td><img src="pic/hm_14.jpg" width="136" height="455" /></td>
    <td><img src="pic/hm_15.jpg" width="156" height="455" /></td>
  </tr>
</table>
</body>
</html>