i have been using html for a while, however i need help in creating a text and submit button, which will allow someone to enter letters into the text box, which will add this to the end of the site address followed by .html .. i am able to get the letters to add to the end of the address, but, it puts a the /?a= in between the address and letters entered,, and does not add the .html . what can i do to made this happen?

i am trying to trying to create a simple submit button to allow someone to access a certain page.. by typing a number in and hitting submit, i would want this to take them to a page reserved for them. while the page will be different per person..any html php help would be helpful