var _content_box = "content";
function initMain(){
    var _div = document.getElementsByTagName("div");
    for(var i=0; i<_div.length; i++){
        if (_div[i].className.indexOf(_content_box) !=-1) {
            var _box = _div[i].getElementsByTagName("div")[0];
            if(_box){
                _div[i].parentNode.parentNode.style.width = _box.offsetWidth + "px";
            }
        }
    }
}
if (window.addEventListener) window.addEventListener("load", initMain, false);
else if (window.attachEvent && !window.opera) window.attachEvent("onload", initMain);