Pure JS JSONP call

jsonp.js

function jsonp(url, callback, name, query)
{                
    if (url.indexOf("?") > -1)
        url += "&" + callback + "=" 
    else
        url += "?"+ callback +"=" 
    url += name + "&";
    if (query)
        url += encodeURIComponent(query) + "&";   
    url += new Date().getTime().toString(); // prevent caching        
    
    var script = document.createElement("script");        
    script.setAttribute("src",url);
    script.setAttribute("type","text/javascript");                
    document.body.appendChild(script);
}