If you would like to use TightVNC in a browser on a computer without TightVNC viewer, you can use the http:// + the web address and the port number 5800 (which you can easily change). Example: http://192.168.1.7:5800
On the computer you are working on, go to the control panel, Java, add the web address to the security tab. Next, enter the web address with :5800. Wait. you will recieve a warning, click Run, enter your password and manage the computer from your browser.
Always make sure TightVNC and Java are up-to-date.