function getByClass( className, context) {    var context = context || document;    if( context.getElementsByClassName) {        return context.getElementsByClassName(className);    }    var nodes = context.getElementsByTagName("*");    ret=[];    for( var i=0; i<nodes.length; i++) {        if( hasClass(nodes[i],className)) {            ret.push(nodes[i]);        }    }    return ret;}function hasClass ( node, className) {    var names = node.className.split(/\s+/);    for ( var i=0;i<names.length;i++) {        if(names[i]==className) {            return true;        }    }    return false;}