is it possible squid to use simultaneously two real IP's on eth0 for http request?

["Pavel M. Ivanchev" <pavel.ivanchev@xxxxxxxxx>]

Hi all!
The quiestion is maybe little bit confusing,but in simply words i just 
want to explain the followind situation :
i have squid with two ethernet cards - eth0 and eth1,eth0 is connected 
to Internet with 4 real IP addresses-eth0,eth0:1,eth0:2,eth0:3, and eth1 
is local - connected to the LAN.
Squid use by default for http request the first real IP address - eth0. 
Is it possible in some way to use and eth0:1 as well as eth0 for 
requests,or in other words i want one group of users ,based on the LAN 
IPs, when they send http request to Internet via squid,the source to be 
IP address of eth0 and the other group source  IP address to be  IP 
address of eth0:1.