var swfu;
var init_uploader = function() {
	swfu = new SWFUpload({
		upload_script : upload_url,
		target : "SWFUploadTarget",
		flash_path : swfupload_url
		//many more options which you must determine for yourself - see the SWFUpload docs and examples
	});
	swfu.loadUI();
};

//please use better handler attachment than this:
window.onload = init_uploader;