Center screen

Third question in a row! :D

Could anyone please help me centering the animation i make from the following bitblt call...

VB Code:

Dim MovePic As Integer
Dim MoveUp, SinX As Single
 
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
 
 
 
Private Sub Form_Load()
SinX = 20
End Sub
 
Private Sub MoveDown_Timer()
MovePic = MovePic + 2
 
If MoveUp <= -1 Then
    Timer2.Enabled = True
    MoveDown.Enabled = False
    
Else
    MoveUp = MoveUp - 0.1
End If
SinX = Sin(MoveUp) * 50
End Sub
 
Private Sub Timer1_Timer()
Me.Cls
'Draws the mask with vbSrcAnd raster operation
BitBlt Me.hDC, MovePic, SinX, picMask.ScaleWidth, picMask.ScaleHeight, picMask.hDC, 0, 0, vbSrcAnd
'Draws the sprite witht the vbSrcPaint raster operation
BitBlt Me.hDC, MovePic, SinX, picSprite.ScaleWidth, picSprite.ScaleHeight, picSprite.hDC, 0, 0, vbSrcPaint
 
End Sub
 
Private Sub Timer2_Timer()
MovePic = MovePic + 2
If MoveUp >= 1 Then
    MoveDown.Enabled = True
    Timer2.Enabled = False
Else
    MoveUp = MoveUp + 0.1
End If
SinX = Sin(MoveUp) * 50
End Sub