function toggle_main_news_tab(number) {
	$('img_main_news_1').src = '/Cylearn2007/public/images/home/news_tap_a1.gif';
	$('img_main_news_2').src = '/Cylearn2007/public/images/home/news_tap_b1.gif';
	$('img_main_news_3').src = '/Cylearn2007/public/images/home/news_tap_c1.gif';
	$('img_main_news_4').src = '/Cylearn2007/public/images/home/news_tap_d1.gif';
	var id;
	switch(number) {
		case 1: 
			id = "img_main_news_1";
			$(id).src='/Cylearn2007/public/images/home/news_tap_a2.gif';
			break;
		case 2:
			id = "img_main_news_2";
			$(id).src='/Cylearn2007/public/images/home/news_tap_b2.gif';
			break;
		case 3:
			id = "img_main_news_3";
			$(id).src='/Cylearn2007/public/images/home/news_tap_c2.gif';
			break;
		case 4:
			id = "img_main_news_4";
			$(id).src='/Cylearn2007/public/images/home/news_tap_d2.gif';
			break;
	}
}