$(document).ready(function() {

	var page=1;
	$("div[id^='content_part_']").hide();
	$("#content_part_1").show();
	$("a[id^='page_']").click(function() {
		var page_id = $(this).attr('id').split('_');
		page_id = page_id[1];
		
		if(page_id=='prev')
			page = (page>1 ? parseInt(page)-1 : 1);
		else if(page_id=='next')
			page = (page<total_pages ? parseInt(page)+1 : total_pages);
		else
			page = page_id;
		
		//alert('page='+page+"\n total_pages="+total_pages);
		
		$("div[id^='content_part_']").hide();
		$("#content_part_"+page).show();
		
		$("span[id^='left_span_']").removeClass('left_active');
		$("span[id^='center_span_']").removeClass('center_active');
		$("span[id^='right_span_']").removeClass('right_active');
		
		$("#left_span_"+page).addClass('left_active');
		$("#center_span_"+page).addClass('center_active');
		$("#right_span_"+page).addClass('right_active');
	});
	
});