function loadJSFile(externalFileURL,parentObject,objectID){
	if(!document.getElementById(objectID)){
		var scriptObject=document.createElement('script');
		scriptObject.setAttribute("type","text/javascript");
		scriptObject.setAttribute("id",objectID);
		scriptObject.setAttribute("src", externalFileURL);
		if(!parentObject) parentObject = document.getElementsByTagName("head")[0];
		else parentObject = document.getElementById(parentObject);
		if (typeof scriptObject!="undefined")
		parentObject.appendChild(scriptObject);
	}
}