var animate = function foo(animationVar) {
   if (typeof (foo.inside) === "undefined" && typeof (foo.outside) === "undefined" {
       foo.outside = 0;
       foo.inside = 0; 
   }
   foo.outside++;
   ...
   foo.inside++;
   if (foo.outside !== foo.inside) return;
   window.setTimeout(function() {animate(animationvar + 1);}, 50);
}