var nClassArray = new Array(
"nScreen",
"nAjax",
"nPopUp",
"nLayer",
"nInterval",
"nEditor",
"nTween"
);

for(i=0;i<nClassArray.length;i++){
  document.write('<script type="text/javascript" src="nJs/'+nClassArray[i]+'.class.js"></script>');
}