function sidebarRightArticles() {}

sidebarRightArticles.init = function() {
    var links = document.getElementsBySelector('div.sidebar_right_list a.article_preview');
    for (var i = 0; i < links.length; i++) {
      imos.element(links[i]).addEvent('mouseover', sidebarRightArticles.changeImage);
    }
}

sidebarRightArticles.changeImage = function (event, target) {
    imos.element('article_preview_image').src =  imos.element(target.id.replace(/article_preview_/, 'article_preview_image_')).src;
}