leftmousebutton problem

[Trakan]

So i'm doing a kind of panel, basically i want to show it when you click on the panel image:


But when i click, (everywhere else, don't matter if its on the image or not), it shows correctly.

How can i make it show only if i click on the image?

Class:

PHP Code:

// Scripted by *Trakan

function onActionServerSide(null) {
  serverr.available_quests += 1;
}
//#CLIENTSIDE
  if (leftmousebutton) {
QuestMenu_Window1.show();
}
function onCreated() {
  onTimeout();


  new GuiWindowCtrl("QuestMenu_Window1") {
    clientrelative = true;
    clientextent = "570,374";
    canmaximize = false;
    profile = GuiBlueWindowProfile;
    useOwnProfile = true;
    canmove = true;
    canresize = false;
    closequery = false;
    destroyonhide = false;
    text = "Available Quests";
    x = screenheight/2;
    y = 50;
    profile.bitmap = "gh_gui-general.png";
    profile.fillColor = {58,63,37};

    new GuiTextCtrl("QuestMenu_Text1") {
      profile = GuiBlueTextProfile;
      height = 25;
      horizsizing = "center";
      text = "Available Quests (" @ serverr.available_quests @ "/" @ serverr.maxquests @ ")";
      width = 140;
      x = 225;
      y = 5;
    }
    new GuiBitmapButtonCtrl("QuestMenu_Button1") {
      text = "   JOIN";
         width = 48;
         heigh = 24;
      x = 462;
      y = 40;
   normalbitmap = "gh_gui-button.png";
   mouseoverbitmap = "gh_gui-button.png";
   pressedbitmap = "gh_gui-button.png";
    }

        new GuiBitmapButtonCtrl("QuestMenu_Button2") {
      text = "  INFO+";
         width = 48;
         heigh = 24;
      x = 515;
      y = 40;
   normalbitmap = "gh_gui-button.png";
   mouseoverbitmap = "gh_gui-button.png";
   pressedbitmap = "gh_gui-button.png";
    }
    new GuiTextCtrl("QuestMenu_Text2") {
      profile = GuiBlueTextProfile;
      height = 20;
      text = "Type: Recolte";
      width = 80;
      x = 367;
      y = 46;
    }
    new GuiTextCtrl("QuestMenu_Text3") {
      profile = GuiBlueTextProfile;
      height = 20;
      text = "RANK: ";
      width = 74;
      x = 268;
      y = 46;
    }
    new GuiTextCtrl("QuestMenu_Text4") {
      profile = GuiBlueTextProfile;
      height = 20;
      text = "Quest: " @ serverr.quest1_questname;
      width = 206;
      x = 35;
      y = 46;
    }
    new GuiBitmapCtrl("QuestMenu_Bitmap1") {
      profile = GuiDefaultProfile;
      bitmap = "gh_icon_health-potion.png";
      fullbitmap = false;
      height = 62;
      x = 7;
      y = 43;
    }
}
}
function QuestMenu_Button1.onAction() {
 if (serverr.available_quests != serverr.maxquests) {
triggerserver("gui", this.name, null);
}

}

function onTimeout()
  {
if (serverr.quest1_available == true) {
QuestMenu_Button1.hide();
QuestMenu_Button2.hide();
QuestMenu_Text2.hide();
QuestMenu_Text3.hide();
QuestMenu_Text4.hide();
QuestMenu_Bitmap1.hide();
} else if (serverr.quest1_available == false) {
QuestMenu_Button1.show();
QuestMenu_Button2.show();
QuestMenu_Text2.show();
QuestMenu_Text3.show();
QuestMenu_Text4.show();
QuestMenu_Bitmap1.show();
}

  QuestMenu_Text1.text = "Available Quests (" @ serverr.available_quests @ "/" @ serverr.maxquests @ " )";
  setTimer(0.1);
}