//synchronous
    body.innerHTML = render('blog.html',data)

    //asynchronous
    render('blog.html',data,body)

    render=function(url,data,obj){
        if url in cache: use cache
        var http = xmlhttprequest()
        http.get(url,obj?async:sync)
        http.onready: 
            parse data in html 
            if obj: obj.innerHTML = html
            else: return html
    }