I have installed a Joomla 1.5.9 and it runs perfectly in front end. Then I try to login in backend the system report an error like this below:
500 Internal Server Error
The request was not completed. The server met an unexpected condition.
7x.5x.1xx.23/~centersit/administrator/index.php (port 80)
Please forward this error screen to [...]

I found a good component that support more additional field in your contact form field in joomla. The component derived from com_contact, the standard component distributed with Joomla!, and offering several additional features. 1) More contact fields: Yahoo Messenger Id and Skype Id to provide your visitors with an alternate way to send a message [...]

The tutorial explain on how to reset your joomla 1.5 password.
Here’s how:
1. Go to your Cpanel (www.yourdomain.com/cpanel) -> Phpmyadmin.
2. Run the command below to reset the password:

UPDATE `jos_users` SET `password` = "49f55cfe53b93f1d319d3e0a30df0db8:4×8azSlxWF19MiSb55gu8ybVSMpIXanA" WHERE `jos_users`.`id` =62;
3. Log in in your joomla 1.5 admin using this password: password1
4. Goto [...]

If you are looking a plugin to put iframes in external site or content within a page content without having to handcode HTML. Click the link below.

To enable you to place Javascript, PHP and CSS right in to your content! Not only in your articles, but also in sections, categories, modules, components, META tags, etc. Click the link below to visit the Joomla plugins.

If you’re having problem with mootools.js here is the fix.
Put the code below in your custom joomla template: