function DSFS(url) { // url : script de traitement, 
			// uploadmod : flashobject charger de l'upload de plusieurs fichiers
	
	/* verification des dependances */
	if (!xhrQuery || !xhrProc) {
		alert('DSFS Erreur Fatale : Dependances non satisfaites');
		return false;
	}
	
	/* variables d'initialisation */ 
	this.gateway = url;
	
	/* evenements */
	this.onprogress = null;
	this.onfileselect = null;
	this.onfilesupload = null;
	
	/* données internes */
	this.files = new Array();
	this.swf = null;
	
	/* variables local */
	var self = this;
	
		
	/*****************************/
	/* Methodes de configuration */
	/*****************************/
	
	this.setSWF = function (swf) {
		this.swf = swf;
		return swf;
	}
	
	
	/* appelée lors de l'évenement du flash object filReference onProgress */
	
	this.onFileProgress = function (name, upped, total) {

		this.files[name]['up'] = upped;
		this.files[name]['total'] = total;
		if (this.onprogress) this.onprogress(name, upped, total);
	}
	
	/********************/
	/* Methodes Metiers */
	/********************/
	
	this.browseForUpload = function () {
		if (!this.swf) {
			alert("pas d'objet flash detecté !");
			return false;
		}
		this.swf.parcourir();
		return true;
	}
	
	function upload() {

		if (!this.swf) {
			alert("pas d'objet flash detecté !");
			return false;
		}
		if (this.onfilesupload) this.onfilesupload();
		this.swf.upload(this.gateway + "action=upload");
		return true;
	}
	
	this.write = function (file, content, onsuccess, rmode) {
		if (!rmode) rmode = 'bin';
		var xhr = new xhrQuery(this.gateway + '?action=write', 'POST');
		xhr.addPost('file', file);
		xhr.addPost('content', content);
		xhr.addPost('mode', rmode);
		xhr.callback = function (respo) {
			if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\n Erreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return file;
	}
	
	this.append = function (file, content, onsuccess, rmode) {
		if (!rmode) rmode = 'bin';
		var xhr = new xhrQuery(this.gateway + '?action=append', 'POST');
		xhr.addPost('file', file);
		xhr.addPost('content', content);
		xhr.addPost('mode', rmode);
		xhr.callback = function (respo) {
			if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\n Erreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return file;
	}
	
	this.read = function (file, onsuccess, rmode) {
		if (!rmode) rmode = 'bin';
		var xhr = new xhrQuery(this.gateway + '?action=read', 'POST');
		xhr.addPost('file', file);
		xhr.addPost('mode', rmode);
		xhr.callback = function (respo) {
			// if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\n Erreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return file;
	}
	
	this.remove = function (file, onsuccess) {
		var xhr = new xhrQuery(this.gateway + '?action=remove', 'POST');
		xhr.addPost('file', file);
		xhr.callback = function (respo) {
			if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\n Erreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return file;
	}
	
	this.browse = function (dir, deep, onsuccess) {
		var xhr = new xhrQuery(this.gateway + '?action=browse', 'POST');
		xhr.addPost('dir', dir);
		xhr.addPost('deep', deep);
		xhr.callback = function (respo) {
			// if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\n Erreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return true;
	}
	
	this.mkDir = function (dir, onsuccess) {
		var xhr = new xhrQuery(this.gateway + '?action=mkdir', 'POST');
		xhr.addPost('dir', dir);
		xhr.callback = function (respo) {
			if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\nErreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return true;
	}
	
	
	this.rename = function (oldname, newname, onsuccess) {
		var xhr = new xhrQuery(this.gateway + '?action=rename', 'POST');
		xhr.addPost('old', oldname);
		xhr.addPost('new', newname);
		xhr.callback = function (respo) {
			if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\n Erreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return true;
	}
	
	this.move = function (from, to, onsuccess) {
		var xhr = new xhrQuery(this.gateway + '?action=move', 'POST');
		xhr.addPost('from', from);
		xhr.addPost('to', to);
		xhr.callback = function (respo) {
			if (respo.text) return this.onerror("DSFS Erreur", respo.text);
			if (onsuccess) onsuccess(respo);
			return true;
		}
		xhr.onerror = function (status, statusText) {
			alert(status + " : " + statusText + "\n Erreur lors de l'ecriture du fichier " + file + " .");
		}
		xhrProc.process(xhr);
		return true;
	}
	
}