an enclosure supporter includes a mounting member and two sliding members slidably mounted to the mounting member . the mounting member includes a panel body and a gear pivotally mounted to the panel body . each of the two sliding members includes a rack engaging with the gear . the two racks are substantially parallel to each other and the gear is positioned between the two racks . the two sliding members are slidable along opposite directions substantially parallel to the rack due to the engagement between the gear and the two racks .