Dimension 4400 wireless connection issues........

I am trying to set up a home wireless network for my Dell Dimension 4400, and my Dell 9300 laptop.  I installed a Netgear pci wireless adapter in the 4400, the laptop was wifi ready when we purchased it.  I purchased a Belkin wireless router and we have a Brighthouse modem.  The short story is that there is no ethernet connection point on the 4400.  My router requires me to connect an ethernet cable to the computer, which I cannot do.  Do I have any other alternative method of setting up this computer for wireless connection?  Would there be a way to add an ethernet port?  A different router?  Would it be simpler to just replace the 4400 with a newer model? I am new here, and thanks up front for any help you can give me.