function showcat(sid,num)
	{
		for (var i=1;i<=num;i++)
			{
			if (i == sid)
				eval("cat_"+sid+".style.display=\"\";");
				else
				eval("cat_"+i+".style.display=\"none\";");
			}}
	function showbj(a,b,pic1,pic2)
	{
		for (var ii=1;ii<=b;ii++)
			{
			if (ii == a)
				eval("cat"+a+".background=\"/images/"+pic1+"\";");
				else
				eval("cat"+ii+".background=\"/images/"+pic2+"\";");
			}}
	function bj(pic1)
	     {
		eval("cat_.background=\"/images/"+pic1+"\";");
	}