function chnews(num,name,cnt,lb){
	
	fullname=name+"bbj";
	for (i=1;i<cnt+1;i++){
		fullname1=name+"tit";
		fullname2=name+"list"+i;
		if (i==num){
			if (lb==1){document.getElementById(fullname).className = fullname+i;}
			
			document.getElementById(fullname1+i).className = "bh2tit1";
			document.getElementById(fullname2).style.display="block";
		}
		else{
			document.getElementById(fullname1+i).className = "bh2tit2";
			document.getElementById(fullname2).style.display="none";
		}
	}
}