function session_keeper(delta) {
	if (self.setInterval) {
	  var code = "var i = new Image();\n";
	  code += "r = Math.floor(10000000*Math.random());\n";
	  code += "i.src = '" + PATH_BASE + "home/empty/r/' + r ;\n";
	  code += "i.onload = function() {delete(i);}\n";

	  if (typeof(delta) != 'number') {
		  delta = 1;
	  }

	  // toutes les cinq minutes
	  self.setInterval(code, delta * 60*1000);
  }
}

//session_keeper(10);


function progress(action,id){
	if(id == null){
		id = 'progress';
	}
	
	if(action == null){
		action = true;
	}

	var elt = $(id);
	if(action){
		elt.src = PATH_BASE + "images/global/mini_progess.gif";
	}  else {
		elt.src = PATH_BASE + "images/global/spacer.gif";
	}
}

function none(the_css_class){
	var list_input = $$('.' + the_css_class);
	list_input.each(function(value, index){	value.checked = false; });		
	return false;
}

function all(the_css_class){
	var list_input = $$('.' + the_css_class);
	list_input.each(function(value, index){	value.checked = true; });		
	return false;
}

function delete_html(html_id) {
	if (confirm('Supprimer ?')) {		
		Effect.Fade(html_id, {duration:0.5});							
	}
}