Вставляем в body: 
 Code
<style> 
 .myimage{ 
 position:relative 
 }</style>
  
 Остальное — в body: 
 Code
<script language="JavaScript1.2"> 
 var rector=2 
 var stopit=0  
 var a=1 
 function init(which){ 
 stopit=0//osw  
 shake=which 
 shake.style.left=2 
 shake.style.top=2 
 } 
 function rattleimage(){ 
 if ((!document.all&&!document.getElementById)||stopit==1) 
 return//fantasyflash.ru 
 if (a==1){ 
 shake.style.top=parseInt(shake.style.top)+rector 
 } 
 else if (a==2){ 
 shake.style.left=parseInt(shake.style.left)+rector 
 } 
 else if (a==3){ 
 shake.style.top=parseInt(shake.style.top)-rector 
 } 
 else{ 
 shake.style.left=parseInt(shake.style.left)-rector 
 } 
 if (a<4) 
 a++ 
 else 
 a=1 
 setTimeout("rattleimage()",65) 
 } 
 function stoprattle(which){ 
 stopit=1 
 which.style.left=0 
 which.style.top=0 
 } 
 </script> 
 <a href="http://fantasyflash.ru"><img src="http://fantasyflash.ru/avatar/ava_dog/image/dog3.jpg" class="myimage" onMouseover="init(this);rattleimage()" onMouseout="stoprattle(this);top.focus()" onClick="top.focus()" border=0></a>
  
 Не забудьте поменять пути к своим картинкам :)