$.getScript('test.js',function(){
 alert('done');
});

function loadJs(url,callback){
 var script=document.createElement('script');
 script.type="text/javascript";
 if(typeof(callback)!="undefined"){
 if(script.readyState){
 script.onreadystatechange=function(){
 if(script.readyState == "loaded" || script.readyState == "complete"){
 script.onreadystatechange=null;
 callback();
 }
 }
 }else{
 script.onload=function(){
 callback();
 }
 }
 }
 script.src=url;
 document.body.appendChild(script);
 }
 loadJs("test.js",function(){
 alert('done');
 });