Petit point gris sur mes Images

function mynav (page) {
    
    var myPages = new Array("home","build","books","f.a.q");
    var myPageimg = new Array("images/home.png","images/build.png","images/books.png","images/faq.png");
    var myPageimg_active = new Array("images/home_active.png","images/build_active.png","images/books_active.png","images/faq_active.png");
    var myTooltip = new Array("Return to Homepage","Create a Book","Manage Books","Frequently Asked Questions");
    var pageLinks = new Array("index.php","build.php","books.php","faq.html");
    
for ( var i=0, len=myPages.length; i<len; ++i ){
        if (myPages[i]==page) {
            document.writeln(' <li class="current_page_item"><a href="'+ pageLinks[i] +'" target="_self"><img src="'+ myPageimg_active[i] +'" title="'+ myTooltip[i] +'" border="0"></a></li>');
        } else {
            document.writeln(' <li><a href="'+ pageLinks[i] +'" target="_self"><img src="'+ myPageimg[i] +'" title="'+ myTooltip[i] +'" border="0"></a></li>');    
        }
    }

}

#nav {
    background: #ccc; /* for non-css3 browsers */
    /*filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#cccccc', endColorstr='#000000'); /* for IE */
    /*background: -webkit-gradient(linear, left top, left bottom, from(#ccc), to(#000)); /* for webkit browsers */
    /*background: -moz-linear-gradient(top, #ccc, #000); /* for firefox 3.6+ */
    width:100%;
    height:60px;
    border-top:1px solid #242424;
    border-right:1px solid #242424;
    border-bottom:1px solid #242424;
    border-left:1px solid #242424;
}

/* menu */
#menu {
background: none;
font-weight:bold;
position:absolute;
top:85px;
padding-left:0px;
margin-left:-40px;
}
            
#menu ul li {
float:left;
}

#menu ul a {
float:left;
padding:10px;
}