Bug 179636 [Smoke] Chart can not be previewed [0001]
Description: Chart can not be previewed Build number: 2.2.0.v20070328-0630 Steps to reproduce: 1. New a chart, preview. Expected result: Chart is displayed correctly. Actual result: Chart can not be previewed. Error log: N/A
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
public static final String PARAM_OVERWRITE = "__overwrite"; 
	/**
	 * URL parameter name that gives the image ID to display.
	 */
	public static final String PARAM_IMAGEID = "__imageID"; 
	/**
	 * URL parameter name that gives the bookmark expression.
	 */
	public static final String PARAM_BOOKMARK = "__bookmark"; 
	/**
	 * URL parameter name that gives that image rtl option.
	 */
	public static final String PARAM_RTL = "__rtl"; 
	/**
	 * URL parameter name that gives the preview max rows option.
	 */
	public static final String PARAM_MAXROWS = "__maxrows"; 
	/**
	 * URL parameter name that gives the reportlet id.
	 */
	public static final String PARAM_INSTANCEID = "__instanceid"; 
	/**
	 * URL parameter name to indicate whether need to run a reportlet.
	 */
	public static final String PARAM_ISREPORTLET = "__isreportlet";
	/**
	 * URL parameter name to indicate the export encoding.
	 */
	public static final String PARAM_EXPORT_ENCODING = "__exportEncoding";
	/**