var menu = document.getElementById('hor_menu');
var cn = menu.childNodes;
var count_divs = 0;
for(i in cn) {
    if(cn[i].tagName == "DIV") {
      count_divs++;
    }
}
var items_w = Math.floor(1003 / count_divs);
var first_div = true;
for(i in cn) {
    if(cn[i].tagName == "DIV") {
        cn[i].style.width = items_w + "px";
        if(first_div) {
            first_div = false;
            cn[i].className += " first";
        }
    }
}

function bi(obj, url) {
    url = 'url(' + url + ')';
    if(obj.backgroundImage) {
        obj.backgroundImage = url;
    } else {
        obj.style.backgroundImage = url;
    }
}