function showsub_a(id,a,b){
for (i = a;i<b;i++){
	document.getElementById("tab_a"+i).className = "";
	document.getElementById("sub_a"+i).style.display = "none";
}
	document.getElementById("tab_a"+id).className = "selected";
	document.getElementById("sub_a"+id).style.display = "";
}
//*--bbs
function changeKeyword(strObj){
	if(strObj=='subject'){
		document.getElementById('keyword').name='field';
	}
	else if(strObj=='titlename'){
		document.getElementById('keyword').name='srchtxt';
	}
}
function _submitBBS(){
	if(document.getElementById('mainTitle').value=='subject'){
		if(document.getElementById('keyword').value==''){
			alert('请输入社区论坛关键字！');
		}else{
			document.getElementById('formsearch').action='http://www.tiaofun.com';
			document.getElementById('formsearch').submit();
		}
}
	else if(document.getElementById('mainTitle').value=='titlename'){
		if(document.getElementById('keyword').value==''){
			alert('请输入帖子关键字！');
		}else{
			document.getElementById('formsearch').action='http://www.tiaofun.com';
			document.getElementById('formsearch').submit();
		}
	}
	return false;
}