var timer;
var length;
var pos;

function refresh_slide(idShowImage){
$("#quem_participa a").css("visibility","hidden");
$(idShowImage).css("visibility","visible").css("opacity","0").animate({"opacity":1},300, "linear", null);
clearTimeout(timer);
$(idShowImage).animate({"opacity":1},300, "linear", null);
}

function slide_imagens(qtd){
  pos = 0; length = qtd;
  carrega_novo();
}

function carrega_novo(){
   pos = (pos+1)%length;
   refresh_slide("#slide_"+pos);
   timer = window.setTimeout(eval("carrega_novo"),3000);
}