The issue of html tags being stripped from content vexed a lot of people in version 1.5 of Joomla. Using the JCE editor helped, along with turning off the WYSIWYG editor.
In Joomla 1.7 it’s a lot simpler to add html code, like an embedded Google map, using the editor. But first you need to turn off or update filtering for the user type in question, using the Article Manager settings.
Go to Article Manager, select Options, Text Filters and change the option for the User Group. No filtering allows all content to be input in the editor. You can also update the blacklist for other users.
I found the answer to this here: http://nabtron.com/joomla-editor-removing-flash-object-code-tags-when-saving-article-fixed/6472/