Html / css

[rex64]

I am having trouble with Javascript and CSS on my site www.studyx.com

I have sublinks declared in the CSS file. The error I am getting:

Error: $("sublinks").getElements is not a function
Source File: http://www.studyx.com/index.php
Line: 42

Also, I do not know where this error came from:

Error: uncaught exception: Error: Permission denied for <http://www.facebook.com> to get property Proxy.InstallTrigger

I got rid of most of my errors:
http://validator.w3.org/check?uri=ht...Inline&group=0

CSS Code:

/* -- SUBLINKS -- */
#sublinks{
    width:auto;
    margin:0 auto;
    background:#888888 url(img/sublink.gif);
    height:30px;
    font-size:11px;
}   
    #sublinks ul{
     height:32px;
     line-height:31px;  
    }
    #sublinks ul li{
        display:inline;
    }
    #sublinks ul li a,
    #sublinks ul li a:visited {
        padding:0 20px;
        display:block;
        text-decoration:none;
        float:left;
        color:#FFFFFF;
    }
    #sublinks ul li a:hover{
        text-decoration:underline;
    }   
.style1 {color: #000000}

Mootools http://mootools.net/download/version/1.1.2 Uncompressed with docs