Activating Sub Routine From Hyperlink

I am still playing with ASP and was wondering how to do this (it seemed
simple). What I want is to have a hyperlink that when it's clicked on, will
run a sub routine, instead of opening a web page... Right now I have;

Sub CreateLinks()
Response.Write "<br><br>"
Response.Write "<a href='OpenAllOrders()'>1. All Orders</a><br>"
Response.Write "<a href='OpenCustOrders()'>2. Customer Orders</a><br>"
Response.Write "<a href='OpenInvoices.asp'>3. Open Invoices</a><br>"
End Sub

Sub OpenAllOrders()
Response.Redirect "OpenOrders.asp?Customer=0"
End Sub

Sub OpenCustOrders()
Response.Redirect "OpenOrders.asp?Customer=1"
End Sub

The issue, is that clicking on the link, tries to open a web page file of
'openallorders()', instead of running the sub routine. Obviously I am
missing something simple... Can anyone point me in the correct direction
(think it has something to do with href... maybe it should be hsub or
something).