Thanks for your reply,
I thought I could do it like this,
I replace the content of dynmap with my website, then it shows me my website when you connect to 145.234.67.78...... right? So if I could create another dynmap plugin with only the web part and not the render thing, I could have another site on a other port, 8124 for example because dynmap is 8123. Then I can redirect my URL to it with an Iframe so that it wont show you the IP. Thought this could be handy, I could host my website at a webhoster but don' t have a really big server yet, so still not the budget what comes with one.