Create External Site Links with headers

Code Links to external sites like this: [login to view URL]://[login to view URL] My site will link to other sites and the content of these sites will appear but the user will never leave my site I have no idea how this process works. The links are housed in some php code. I have on my website 300 links that need to be arranged in this way. The header will be the navbar of my page and a few extra links/ notes to the user. Hope this is clear enough Thanks!