Need Help Choosing Relay for Momentary

        Hi.  I'm not very knowledgable with electrical circuits and devices so I need some help.I have a Vandal Resistant LED momentary switch ( http://www.bulgin.co.uk/Products/Switches/Illuminated.html) that I want to use to turn on and off some cold cathode lights in my computer.The switch has 4 prongs - 2 for the device being operated and 2 to power the LED on the switch itself.I would like to use a relay which would allow me to turn on the cathode lights and the LED on the switch when the button is pressed - and turn both off when the SAME button is pressed again.I assume I would need a single coil DPDT? ( http://www.medibix.com/runsearch.jsp?category_id=14124&productsort=manufacturer&view=sku&product_id=455747)Single coil allowing me press the button, activate the relay and turn on the lights - press button 2nd time to activate relay and turn off the lights?and DPDT allowing me to connect both the actual light to be controlled and also a separate circuit for the LED on the button itself?The power sources will be 12V for the cathode light and 5V for the LED

Maybe a switch that will allow Latched On/Off Output Using a Single Momentary Pulse like here ( https://www.the12volt.com/relays/page5.asp#lsp) but w/o wiring 4-5 simple relays together.