Multihomed Multi ISP/Internet - packets go out the wrong interface

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Hi all, i hope someone got some suggestions.
I have a Server 2003, 2 Network Cards, 2 Networks (10.10.x.x and
10.4.x.x)
The 10.10.x.x goes to a router, connected to a DSL Line (whis is also
the default gateway).
The 10.4.x.x also goes to a router whis is connected to an E1 Line.

The Server is running IIS. I am trying to make the website reachable
from both internet/ISP connections.
The problem is, if i connect from the E1, the server actually receives
the traffic, but sends the replies out the wrong interface. Pretty
stupid, since a packet arriving at one interface, the reply should go
out (automatically) the same interface.

Well, its not doing it. It goes in one interface and out the wrong one.

I know some basic routing, but none like Rip or OSPF. But i also know,
that Routers or Firewalls like Cisco Pix is not doing things like the
server does. What goes in one way come out the same way and not
another.

Is there a way to fix that issu with Routing and RAS enabled and what
exactly do i have to configure in order to make that work.

Or do i have to change things on my IIS settings?

Any help would greatly be appreciated.

.

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