Data mine Zillow.com for links

I need several thousand links from Zillow.com. If you visit this link: <[login to view URL]> you will see on the right hand side of the page, what looks like an iframe containing 23 links for houses for sale. At the bottom of the list, it has links for page 2, page 3, etc. I need a program built that will grab the 23 links (or so) off all these pages. I need about 50K links for homes for sale. If the program would save these links, 1 per line, to a .txt file. The program doesn't need to be pretty, so long as it works. I won't be adding anything to this project, its a simple link getter, thats all I need. Thanks.