Like/Dislike Button Problem

I put this code in Javascript Management

var like_version = 'invision';
var DOM_IS_READY = false;
$(function(){DOM_IS_READY=true;});
var vote_singular = 'Like';
var vote_plural = 'Likes';
$.getScript('http://www.avacweb.net/like');

And this one in the CSS

.LGlike {
background: #105289;
padding: 3px;
border-radius: 4px;
color: #fff;
font-size: 10px;
font-weight: bold;
text-shadow: -1px 0.5px #888;
box-shadow: 1px 1px 1px #888;
cursor: pointer;
margin-right: 4px;
}
.LGvote { margin: 0 5px; }
.LGnovote {
filter:Alpha(opacity=50);
opacity: 0.5;
cursor: default;
box-shadow: none;
text-shadow: none;
}

The Like button won't appear...