如何给图片抖动怎做的

〈SCRIPT language = javascript1. 2 〉
〈 !--
var  rector = 2
var  stopit = 0
var  a = 1
var  count = 0
function  init(which) ... {
stopit=0
shake=which
shake.style.left=0
shake.style.top=0
}
function  rattleimage() ... {
if ((!document.all&&!document.getElementById)||stopit==1||count==100)
return
count++
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
count=0
which.style.left=0
which.style.top=0
}
// --〉
〈 / SCRIPT〉
〈style〉.shakeimage  ... {POSITION: relative}
〈 / style〉
〈img src = " 图片的路径 "  onmouseout = stoprattle( this ) onmouseover = init( this );rattleimage() class = shakeimage〉