ie document.getElements ByClass Nameの失効方法を解決します.

if(!document.getElementsByClassName){
        document.getElementsByClassName=function(cls){
            var ret=[];
            var els=document.getElementsByTagName("*");
            for(var i=0;i=0 ||els[i].className.indexOf(cls+" ") ||els[i].className.indexOf(" "+cls+" ") ||els[i].className.indexOf(" "+cls)){
                    ret.push(els[i]);
                }
            }
            return ret;
        }
    }