function init() {
    var gallery = document.getElementById('imglinx');
    var lis = gallery.getElementsByTagName('li');
    for (var i = 0; i < lis.length; i++) {
        lis[i].getElementsByTagName('a')[0].onmouseover = function() {
            this.className = 'mouseover';
        };
        lis[i].getElementsByTagName('a')[0].onmouseout = function() {
            this.className = '';
        };
    }
}

addLoadListener(init);