Opacity for IE8

HTML

<div id="page">
<div id="1">30% opacity</div>
<div id="2">100% opacity</div>   
</div>

CSS

#page{padding:1em; background-color: green;}
div { 
    width:300px;
    height:200px;
    text-align:center;
    vertical-align:middle;
    background-color: Yellow;
    border: 2px solid Black;
}

JavaScript

$(document).ready(function(){
    $("#page").css({opacity: 0.3});
});