Bug 176681 Issue about creating context-parameter path in read-only path[0601]
Description: Issue about creating context-parameter path in read-only path Build number:2.2.0.v20070308 Steps to reproduce: 1. Deploy birt. 2. Set BIRT_VIEWER_DOCUMENT_FOLDER/BIRT_VIEWER_IMAGE_DIR/.. to a read-only path. 3. Preview report. Expected result: Because the path is read-only, folders should be created in ${java.io.tmpdir} Actual result: No folders are created in ${java.io.tmpdir} and reports cannot be previewed in frameset mode.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
sbHtmlEncoded.append( "&#34;" ); 
					break;
				case '\'' :
					sbHtmlEncoded.append( "&#39;" ); 
					break;
				case '<' :
					sbHtmlEncoded.append( "&#60;" ); 
					break;
				case '>' :
					sbHtmlEncoded.append( "&#62;" ); 
					break;
				case '`' :
					sbHtmlEncoded.append( "&#96;" ); 
					break;
				case '&' :
					sbHtmlEncoded.append( "&#38;" ); 
					break;
				default :
					sbHtmlEncoded.append( c );
			}
		}
		sHtmlEncoded = sbHtmlEncoded.toString( );
		return sHtmlEncoded;
	}
	/**
	 * This function is used to decode a htmlEncoded string and convert to the
	 * orginial string
	 * 
	 * @param s
	 * @return String