Joomla Add Style Decleration

Adds an internal stylesheet to the document object. The stylesheet is appended to the document objects' internal stylesheet buffer for the specified type.

Syntax

void addStyleDeclaration( $content, $type )
where:

Argument	Data type	Description	Default
$content	string	Stylesheet content.
$type	string	MIME type of stylesheet.	'text/css'

Example

To add a CSS style to the document, you could use:

$doc =& JFactory::getDocument();
$style = 'BODY {'
        . 'background: #00ff00;'
        . 'color: rgb(0,0,255);'
        . '}'; 
$doc->addStyleDeclaration( $style );

source: http://docs.joomla.org/JDocument/addStyleDeclaration