function loadjscssfile(filename, filetype){
 if (filetype=="js"){ //if filename is a external JavaScript file
  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")
  //alert(filename + ' loaded');
  document.getElementsByTagName("head")[0].appendChild(fileref)
}
 
var filesadded="" //list of files already added
 
function checkloadjscssfile(filename, filetype) {
 if (filesadded.indexOf("["+filename+"]")==-1) {
//	alert(filename);
        loadjscssfile(filename, filetype);
//        if (filetype == 'js') {
            filesadded+="["+filename+"]" //add to list of files already added, in the form of "[filename1],[filename2],etc"
//        }
 }
 else {
//  alert("file already added!")
 }
}

function removejscssfile(filename, filetype){
 var targetelement=(filetype=="js")? "script" : (filetype=="css")? "link" : "none" //determine element type to create nodelist from
 var targetattr=(filetype=="js")? "src" : (filetype=="css")? "href" : "none" //determine corresponding attribute to test for
 var allsuspects=document.getElementsByTagName(targetelement)
 for (var i=allsuspects.length; i>=0; i--){ //search backwards within nodelist for matching elements to remove
  if (allsuspects[i] && allsuspects[i].getAttribute(targetattr)!=null && allsuspects[i].getAttribute(targetattr).indexOf(filename)!=-1)
   allsuspects[i].parentNode.removeChild(allsuspects[i]) //remove element by calling parentNode.removeChild()
 }
}