Bug 193875 we can not get an entir url by IHTMLActionHandler
we can not get an entir url by IHTMLActionHandler, so word emitter dose not write the right url. now hyperlink drill through in word emitter doesn't work.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
if ( !file.exists( ) )
			return file.mkdirs( );
		return true;
	}
	/**
	 * Returns the temp image folder with session id
	 * 
	 * @param request
	 * @return
	 */
	public static String getImageTempFolder( HttpServletRequest request )
	{
		String tempFolder = imageFolder;
		
		String sessionId = request.getSession( ).getId( );
		if ( sessionId != null )
			tempFolder = tempFolder + File.separator + sessionId;
		return tempFolder;
	}
	/**
	 * Clear the temp files when session is expired
	 * 
	 * @param sessionId
	 */
	public static void clearSessionFiles( String sessionId )
	{
		if ( sessionId == null )
			return;
		
		String tempFolder = documentFolder + File.separator + sessionId;