var rector=3

var stopit=0 
var a=1
var tiempo=0

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

function rattleimage(){
tiempo++
if (tiempo==15){
tiempo=0
return
}
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()",65)
}

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

function makevisiblec(cur,which,opacidad){
strength=(which==0)? 1 : opacidad

if (cur.style.MozOpacity)
cur.style.MozOpacity=strength
else if (cur.filters)
cur.filters.alpha.opacity=strength*100
}