How old are we talkin here. If it just has a cable plug-in then your going to have to take yourself to wally world (WalMart) and buy a cable/video, audio in adapter. They're not expensive. BTW...
Using a cable. It varies based on your DVD Player and TV. Some DVD Players can be connected using Scart, Composite, Component, RGB and HDMI cables. Only use on cable at a time though.