animation up-down

var flag = true;
function animate()
{
   if(flag){
     $("#mascotteLogo").animate({ 
       top: "35px"
      }, 3000 );
    flag = false;
   }else{
      $("#mascotteLogo").animate({ 
        top: "10px"
      }, 3000 );
     flag = true;
  }
}
 
$(function(){
  setInterval ( "animate()", 3000 );
});