code: function addToCache(filename, obj) {
  	if(cacheOn)
  	{
  		var x = cache[filename];
  		if(!x)
  			x = cache[filename] = {};
  		x.mtime = obj.mtime || x.mtime;
  		x.etag = obj.etag || x.etag;
  		x.size = obj.size || x.size;
  	}
  }
docs: Adds information to the cache