How can I run a macro on only the first page of a Word document to delete text boxes?

I've come across some macros on the internet to delete text boxes but the problem is that they delete text boxes for the whole document. I've tried to limit this to the current page but have had no success. I've tried a Do While but it doesn't work because the current page does not change while the macro executes. Does anyone know how to do this? I have the current macro below compliments of http://kellyjones.netfirms.com/visualbasic/textbox.shtml.

Sub Remove_ALL_TextBoxes()
Dim aShape As Shape
For Each aShape In ActiveDocument.Shapes
   If aShape.Type = msoTextBox Then
      aShape.Delete
   End If
Next
End Sub