VB6 Q:Function to pass textbox.text

[Foolios]

I am trying to figure out how to use functions. I have 10 textboxes that will need to be checked for certain things.
I believe I can pass the text from each textbox to the function and then have text returned to the text property of that textbox that made the call via it's change event.
I don't know how to send the textbox's text like that. Do I use THIS ?

Private Sub TxtBxHrs1_Change()
If TxtBxHrs1.Text = "." Then
'TxtBxHrs1.Text = "0.00"
Call CallChngeTxt(Me.Textbox.text)
End If
End Sub

Function CallChngeTxt() As String
    CallChngeTxt = "0.00"
End Function

Can someone show me how to use a function that will allow me to send the text from multiple text boxes? And then return back the edited text to those calling textboxes?