// plugin author :  chenjinfa@gmail.com   
// plugin name : $.include   
// $.include('file/ajaxa.js');$.include('file/ajaxa.css');   
//  or $.includePath  = 'file/';$.include(['ajaxa.js','ajaxa.css']);   
  
$.extend({   
     includePath: '',   
     include: function(file) {   
        var files = typeof file == "string" ? [file]:file;   
        for (var i = 0; i < files.length; i++) {   
            var name = files[i].replace(/^\s|\s$/g, "");   
            var att = name.split('.');   
            var ext = att[att.length - 1].toLowerCase();   
            var isCSS = ext == "css";   
            var tag = isCSS ? "link" : "script";   
            var attr = isCSS ? " type='text/css' rel='stylesheet' " : " language='javascript' type='text/javascript' ";   
            var link = (isCSS ? "href" : "src") + "='" + $.includePath + name + "'";   
            if ($(tag + "[" + link + "]").length == 0) document.write("<" + tag + attr + link + "></" + tag + ">");   
        }   
   }   
});