var old=null;
function changemenu(mydiv){
  var obj = document.getElementById(mydiv);
  if (old!=null&&old!=obj)
    old.style.display='none';
  old=obj;
  if (obj.style.display=='none'){
    obj.style.display='block';
  }else{
    obj.style.display='none';
  }
}

function changemenun(mydiv){
  var obj = document.getElementById(mydiv);
  if (obj.style.display=='none'){
    obj.style.display='block';
  }else{
    obj.style.display='none';
  }
}


function Check_login_Form(){
	if (document.login.username.value==""){
		alert("用户名不能为空！");
		document.login.username.focus();
		return false;
    }
	if (document.login.userpaswd.value==""){
		alert("密码不能为空！");
		document.login.userpaswd.focus();
		return false;
    }
	return true;
}

function Check_joinz_Form(){
	if (document.joinz.uname.value==""){
		alert("我的呢称不能为空！");
		document.joinz.uname.focus();
		return false;
    }
	if (document.joinz.arguedesc.value==""){
		alert("我的意见不能为空！");
		document.joinz.arguedesc.focus();
		return false;
    }
	if (document.joinz.captcode.value==""){
		alert("验证码不能为空！");
		document.joinz.captcode.focus();
		return false;
    }
	return true;
}

function Check_joinf_Form(){
	if (document.joinf.uname.value==""){
		alert("我的呢称不能为空！");
		document.joinf.uname.focus();
		return false;
    }
	if (document.joinf.arguedesc.value==""){
		alert("我的意见不能为空！");
		document.joinf.arguedesc.focus();
		return false;
    }
	if (document.joinf.captcode.value==""){
		alert("验证码不能为空！");
		document.joinf.captcode.focus();
		return false;
    }
	return true;
}
function Check_opposez_Form(obj){
	if (obj.uname.value==""){
		alert("呢称不能为空！");
		obj.uname.focus();
		return false;
    }
	if (obj.arguedesc.value==""){
		alert("反对意见不能为空！");
		obj.arguedesc.focus();
		return false;
    }
	if (obj.captcode.value==""){
		alert("验证码不能为空！");
		obj.captcode.focus();
		return false;
    }
	return true;
}

function Check_opposef_Form(obj){
	if (obj.uname.value==""){
		alert("呢称不能为空！");
		obj.uname.focus();
		return false;
    }
	if (obj.arguedesc.value==""){
		alert("反对意见不能为空！");
		obj.arguedesc.focus();
		return false;
    }
	if (obj.captcode.value==""){
		alert("验证码不能为空！");
		obj.captcode.focus();
		return false;
    }
	return true;
}