If the pages are opening in a new window, that’s generally because the name of the frame you want them to open in is not the name that’s in your target attribute. Right now you have TARGET=“CONTENT” - check to make sure that CONTENT (in all caps) really is the name of the frame you want them to open in. If not, you will need to change either the target, or the name of the frame.
Also, your filename is “listing with maya homes.htm” - as someone else mentioned, spaces in HTML filenames are not a good idea. It’s probably not related to the frame problem you’re having, but it may cause you other problems elsewhere. Replace the spaces with underscores or hyphens, or just take the spaces out and run the words together - like this: listingwithmayahomes.htm.