/**
 * Loads a js- or css-file dynamically
 * 
 * Usage:
 * loadRessourceFile("myscript.js", "js") // dynamically load and add this .js file
 * loadRessourceFile("javascript.php", "js") // dynamically load "javascript.php" as a JavaScript file
 * loadRessourceFile("mystyle.css", "css") // dynamically load and add this .css file
 */
function loadRessourceFile(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")
		document.getElementsByTagName("head")[0].appendChild(fileref);
}