Demo : https://suctreviet.123.st/html-h15.htm

<style>
.shakeimage{
position:relative
}
</style>
<script language="JavaScript1.2">



var stopit=0
var rector=3
var a=1

function init(which){
stopit=0
shake=which
shake.style.left=0
shake.style.top=0
}

function rattleimage(){
if ((!document.all&&!document.getElementById)||stopit==1)
return
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()",50)
}

function stoprattle(which){
stopit=1
which.style.left=0
which.style.top=0
}

</script>

<a href="http://code1k.com" target="blank"><img onmouseout="stoprattle(this);top.focus()" border="0" onclick="top.focus()" height="200" src="http://namtienhai.info/images/back.jpg" onmouseover="init(this);rattleimage()" width="150"
class="shakeimage"/></a>