function open_close(div_name){
	div_name = '#' + div_name;
	if ($(div_name).is(":hidden")) {
      $(div_name).slideDown("slow");
  }
  else {
    $(div_name).slideUp("slow");
  }
};

function hide(){
	if(document.getElementsByTagName) {
		var lista = document.getElementsByTagName("div");

		for(i=0; i < lista.length; i++){
			var abstract_id = lista.item(i).getAttribute("id");
			if(abstract_id != null && abstract_id.substring(0, 9) == "abstract_")
				lista.item(i).style.display='none';
		}
	}
}