Connect wlan-modem to wlan router

Hey crossfire,

I've got a w-lan router by D-Link and a Modem with an integrated W-Lan by Thompson without a bridge function though. The W-Lan from the modem itself is too weak for using it everywhere in the whole house, so I connected the d-link wlan router to the modem by an ethernet cable. Now my question is, how to get the internet working when being connected to the d-link wlan?

Thanks in advance!