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 function loadjscssfile(filename, filetype) {
        if (filetype == "js") { //if filename is a external JavaScript file
            window.console.log('is js script');
            var fileref = document.createElement('script')
            fileref.setAttribute("type", "text/javascript")
            fileref.setAttribute("src", filename)
        }
        else if (filetype == "css") { //if filename is an external CSS file
            var fileref = document.createElement("link")
            fileref.setAttribute("rel", "stylesheet")
            fileref.setAttribute("type", "text/css")
            fileref.setAttribute("href", filename)
        }
        if (typeof fileref != "undefined")
            document.getElementsByTagName("head")[0].appendChild(fileref)
    }
    
    
    var filesadded="" //list of files already added
 
function checkloadjscssfile(filename, filetype){
    if (filesadded.indexOf("["+filename+"]")==-1){
        loadjscssfile(filename, filetype)
        filesadded+="["+filename+"]" //List of files added in the form "[filename1],[filename2],etc"
    }
    else
        alert("file already added!")
}
 
checkloadjscssfile("myscript.js", "js") //success
checkloadjscssfile("myscript.js", "js") //redundant file, so file not added