I want to make a site: search bar

Hello, I wanted to create a website where there was a search bar where users would enter their search term, however their search is only executed for a certain website, than displays the results. I also wanted to create a drop down that allowed the user to pick which sites to search.

Let me know how long it would take you to create something like this, thanks.

For example:

The search bar is set up for: site:www.youtube.com "USERS SEARCH TERM ENTERED HERE"

However the user doesn't see the "site:www.youtube.com" part, they only choose "youtube" from a drop down menu.

After they search they are show results below, much like google

 

Why dont you use Googles Search bar.
It will help to earn some money as well

 

its possible to generate a search from your website but getting all the results is hard.
as the guy above me said use a costume google search bar.
and look only for youtube.com results.

 

Ok, I made a custom google search and added it to my website but when the user searches I don't want them to leave the page. Is there a way to have to the search results displayed below the search bar on the same page?

 

Look at the search function here at DP and try to make something similar.