function showPDFPageLayout(id) {
		//activate the link if selected item is clicked
		if (id != 0 && $('pdf_main' + id).hasClassName('pdf_thumbnail_sel'))
			return true;
		
		//left
		var product_view_elements = new Object(); 	
		product_view_elements = $('left_pdf_set').select('div.pdf_left_desc');	
		for (x in product_view_elements) {
			if (Object.isElement(product_view_elements[x]))
				Element.hide(product_view_elements[x]);
		}
		Element.show('pdf_left' + id );
		
		//main	
		product_view_elements = $('main_pdf_set').select('div.pdf_thumbnail');	
		for (x in product_view_elements) {
			if (Object.isElement(product_view_elements[x]))
				product_view_elements[x].removeClassName('pdf_thumbnail_sel');
		}
		if (id != 0) $('pdf_main' + id).addClassName('pdf_thumbnail_sel');	 
		
		return false;
	}