Bug 209119 Need WebViewer provide cancel function
Need WebViewer provide a cancel function, this will be used to cancel current report execution during designer preview.
viewer/org.eclipse.birt.report.viewer/src/org/eclipse/birt/report/viewer/utilities/WebViewer.java
? VIEWER_FRAMESET
							: VIEWER_PREVIEW;
				}
			}
		}
		
		String maxrows = (String) params.get( MAX_ROWS_KEY );
		
		String maxlevels = (String) params.get( MAX_CUBELEVELS_KEY );
		return createURL( servletName, report, format, true, resourceFolder,
				maxrows, maxlevels );
	}
	/**
	 * Create web viewer url to run the report.
	 * 
	 * @param servletName
	 *            servlet name to viewer report
	 * @param report
	 *            report file name
	 * @param format
	 *            report format
	 * @param resourceFolder
	 *            the resource folder
	 * @param maxrows
	 *            max rows limited
	 * @param maxlevels
	 *            max level member limited
	 * @return valid web viewer url
	 */
	private static String createURL( String servletName, String report,