create a password-protected data entry page

I have a website with a chat box where my visitors spend sometime on it. The default color for the chat box new visitors' name is white. I've developed some fun games for my chat visitors where if a visitor wins 10 games, then I would color their name, and if they win another 10 games, then they would get a membership, after that every time they win 10 games, they get a star starting with yellow, and ending with green (8 levels)...this is all established and you need not to worry about. My project here is to have a simple records page in which I let my moderator manually enter in one column the visitors name and the next column enter their current grade (number of games each visitor has won so far) and save. It should be password protected page with one password (one account). The 3rd column will show the current status for each visitor. If a visitor has won 0-9 games then the cell next to their name would show grayed out graphics (10 grayed out small adjacent pictures) If a visitor has won 10-19 then the first pic will become colored and the rest of the pictures (9) will stay gray. if a visitor has won 20-29 then the fist pic and the second picture will become colored and the rest (8) will stay gray. if a visitor has won 30-39 then the first 3 pics will turn colored and the rest (7) will stay gray. if a visitor has won 40-49 then the first 4 pics will become colored and the last (6) will stay gray. if a visitor has won 50-59 then the first 5 pics will become colored and the last (5) will stay gray. if a visitor has won 60-69 then the first 6 pics will become colored and the last (4) will stay gray. if a visitor has won 70-79 then the first 7 pics will become colored and the last (3) will stay gray. if a visitor has won 80-89 then the first 8 pics will become colored and the last (2) will stay gray. if a visitor has won 90-99 then the first 9 pics will become colored and the last (1) will stay gray. if a visitor has won 100 then all the 10 graphics will be colored. I will provide the pictures both grayed out and the corresponding colored ones. I'f like to have a small button which I can place as a sticky message within my chat box sticky messages which accepts html code. When the button is clicked the page with the grades appears as a window (of maximum width of 300 px) without leaving the main page (ajax?) . Every time the button is clicked the page should refresh itself or reload. The moderator would need to enter their password once and let the cookie last for a long time so they won't have to enter the pass too often. That's about it. hope this is clear for you. If you need more info please let me know. Thank you