function pic(num){
		if(num==1)
		{
			document.getElementById('news1').style.display="";
			document.getElementById('news2').style.display="none";
			document.getElementById('pic1').src="img/news_bg1.jpg";
			document.getElementById('pic2').src="img/news_bg2.jpg";
		}
		else
		{
			document.getElementById('news2').style.display="";
			document.getElementById('news1').style.display="none";
			document.getElementById('pic2').src="img/news_bg4.jpg";
			document.getElementById('pic1').src="img/news_bg3.jpg";
		}
		
	}