Este es el codigo javascript
:
<?php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"(Aqui havia una url)">
<!-- saved from url=(0014)about
:internet -->
<html xmlns="(Aqui havia una url)">
<head>
<title>00000001.gif</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!--Fireworks 8 Dreamweaver 8 target. Created Sun Jan 15 20:50:37 GMT+0100 2006-->
<script language="JavaScript1.2" type="text/javascript">
<!--
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];}
}
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_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];}}
}
//-->
</script>
</head>
<body bgcolor="#ffffff" onload="MM_preloadImages('00000001_f2.gif');">
<a href="javascript
:;" onmouseout="MM_swapImgRestore();" onmouseover="MM_swapImage('n00000001','','00000001 _f2.gif',1);"><img name="n00000001" src="00000001.gif" width="69" height="66" border="0" id="n00000001" alt="" /></a></body>
</html>
?>
Nota: Las variables aun no estan introducidas, estas van en el nombre de las dos imagenes.
Saludos
Introducir javascript en imagen php 
