need help to fix GUI ?

the script runs before the imagebutton enters slots.. it skips function MouseHover()

local gui = script.Parent
local slots = gui.Frame.ScrollingFrame.FrameH
local hats = slots:GetChildren()
local item = gui.Frame.item

function findfirstchild(slots)
if slots.Name == "a1" then
for i = 1,#hats do
    hats[i].MouseEnter:connect(function()
function MouseHover()
wait()
item.ImageLabel.Image = "http://www.roblox.com/Thumbs/Asset.ashx?format=png&width=420&height=420&assetId="..hats[i].id.Value..""
MouseHover()
end
print("successful")
    end)
end
end
end