Help with Counter

[JustMe]

Hello how would i get this counter to stop and close the toolbar when it gets to 300?

Code:

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;/count
function# hWnd message wParam lParam

sel message
,case WM_CREATE
,CreateControl 0 "Static" 0 0 0 0 150 20 hWnd 2
,SetTimer(hWnd 1 1000 0); goto timer    
,case WM_TIMER
,,if(wParam=1)
,,,;timer
,,,str s.getwintext(id(2 hWnd)); s=val(s)+1; s.setwintext(id(2 hWnd))
,,,