function include(file,opt){
    if(file=="") return;
    idfile = file.replace(location.hostname,"");
    idfile = idfile.replace(location.protocol,"");
    idfile = idfile.replace("//","");
    if(document.getElementById(idfile)){
        return
    };
    if(typeof opt=="undefined") opt = {};
    if(typeof opt.cache=="undefined") opt.cache = true;
    if(typeof opt.dom=="undefined")  opt.dom = false;
    if(typeof opt.type=="undefined")  opt.type = "";
    ext = (opt.type!="") ? opt.type : file.substring(file.lastIndexOf('.')+1);
    if(!opt.cache){
        var random = new Date().getTime().toString();
        if(file.indexOf("?")!=-1) file = file+"&"+random;
        else file = file+"?"+random;
    }
    if(opt.dom){
        var head = document.getElementsByTagName('head').item(0)
    }
    switch(ext){
        case "css":
            if(!opt.dom)
                document.write('<link rel="stylesheet" href="'+file+'" id="'+idfile+'" type="text/css"><\/link>');
            else{
                css = document.createElement('link');
                css.rel  = 'stylesheet';
                css.href = file;
                css.type = 'text/css';
                css.id = idfile;
                head.appendChild(css);
            }
            break;
        case "js":
            if(!opt.dom){
                document.write('<script type="text/javascript" id="'+idfile+'" src="'+file+'"><\/script>');
            }
            else{
                script = document.createElement('script');
                script.src = file;
                script.type = 'text/javascript';
                script.id = idfile;
                head.appendChild(script);
                if(typeof opt.oncomplete!="undefined"){
                    script.onreadystatechange = function () {
                        if (script.readyState == 'complete') {
                            if(typeof opt.oncomplete == "function") {
                                eval(opt.oncomplete());
                            }
                        }
                    }
                    script.onload = function () {
                        if(typeof opt.oncomplete == "function") {
                            opt.oncomplete();
                        }
                    }
                }
            }
            break;
    }
}