Bug 182873 JS error when use birt:paramDef with special parameter name.[0603]
Description: Javascript error when use birt:paramDef tag with special parameter name. Build number:2.2.0.v200704180630 Steps to reproduce: Prerequisite: New a report with a report parameter with name ~`!@#$%^&*()-=_+\][{}|';:"/,<>? 1. New a jsp file from BIRT tag template in BIRT Web Project. 2. Input below content in body: <birt:parameterPage id="0" name="customparameterpage" reportDesign="report/customJspTagParamDefName.rptdesign" isCustom="true"> <birt:paramDef id="1" name="~`!@#$%^&*()-=_+\][{}|';:/,?"/> <input type="submit" name="OK" value="submit"/> </birt:parameterPage> 3. Run the jsp file. Expected result: Value can be passed to report. Actual result: Javascript error. A runtime error has accurred... Error log:N/A
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/taglib/ParamDefTag.java
* @throws Exception
	 */
	protected void __handleGeneralDefinition( ) throws Exception
	{
		JspWriter writer = pageContext.getOut( );
		if ( param.getTitle( ) != null )
			writer.write( " title=\"" + param.getTitle( ) + "\" " ); 
		if ( param.getCssClass( ) != null )
			writer.write( " class=\"" + param.getCssClass( ) + "\" " ); 
		if ( param.getStyle( ) != null )
			writer.write( " style=\"" + param.getStyle( ) + "\" " ); 
	}
	/**
	 * Handle output Text Box type parameter
	 * 
	 * @throws Exception
	 */
	protected void __handleTextBox( ) throws Exception
	{
		JspWriter writer = pageContext.getOut( );
		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );
		boolean isNullValue = param.getValue( ) == null;
		
		String displayTextId = encParamId + "_displayText"; 
		String displayTextName = ParameterAccessor.PREFIX_DISPLAY_TEXT
				+ encParamName;
		writer.write( "<input type=\"hidden\" " ); 
		writer.write( " id=\"" + displayTextId + "\" " ); 
		if ( paramDef.isRequired( ) || !isNullValue )