Binding cont..

I had an adsl service, and i have 2 adsl modems,
i was wandering is there anyway (windows xp) that i can use these two modems
to make connections to my isp, and combine the connections.

Ok i know i cant get double the speed by adding the two modems but, i can increase downloads, it jus so happen that i saw the episode onscreensavers about binding two connections, the only problem is.
the modems are USB, i.e. the telephone line goes to the modem, then the modem connects to the pc by USB. And yes its ordinary phone lines not cat5 (networking cable)