Bug 136770 Cannot view report document from web viewer
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
String paramValue = value;
			paramValue = urlEncode( paramValue, "UTF-8" ); 
			queryString += ( isFirst ? "" : "&" ) + name + "=" + paramValue; 
			isFirst = false;
		}
		return queryString;
	}
	/**
	 * Get report format.
	 * 
	 * @param request
	 *            http request
	 * @return report format
	 */
	public static String getFormat( HttpServletRequest request )
	{
		String format = getParameter( request, PARAM_FORMAT );
		if ( format != null && format.length( ) > 0 )
		{
			return format;
		}
		return PARAM_FORMAT_HTML; 
	}
	/**
	 * Get report element's iid.
	 * 
	 * @param request
	 * @return
	 */
	public static String getIId( HttpServletRequest request )