I simple cable splitter would do.
Head to radioshack, and grab a 2-way splitter. Don't get the cheapest, grab the middle ground one.. say $10 prolly.
Try to avoid splitting the line that the internet is on, that should be a direct link. Just split the cable wherever it's convienient, and run a line from your splitter, to the new tv.
http://www.radioshack.com/product.as...t%5Fid=15-2582