Multisession downloading on any Proxy? Squid is possible?

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I am planning to run a small ISP which I'd like to put all users behind a proxy server and a NAT box (so they won't need configuration and it will be forced).

So, I have here two connections to internet which I want to bond them in my proxy server so it will download the whole page on multisession links for all images and elements in each webpage.

for example,

http://www.tek-tips.com/index.htm

contain 20 jpg file and 2 gif file and probaby one swf file, I want my proxy to request for each file in different session using both Available link and transfer it to user immediately.

is that possible? how?

Thanks in advance

 

[codecref]

any idea about this?