function checkweeklytop(n){
	if(document.getElementById('textfieldtop').value == ''){
		ShowAlert(_alertTitle, '请输入电子邮件地址');
		return false;
	}
	
	var a = document.getElementById('textfieldtop').value;
	var emailPat=/^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[_.0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|net|NET|com|COM|gov|GOV|mil|MIL|org|ORG|edu|EDU|int|INT)$/;  
	var matchArray = a.match(emailPat);
	if (matchArray == null) {
		ShowAlert(_alertTitle, "电子邮件格式无效");
		return false;
	}
	
	var answer = document.getElementsByName('zhoukantop[]');
	var flag = false;
	for(var i = 0; i < answer.length; i++){
		if(answer[i].checked == true){
			flag = true;
			break;
		}
	}
	if(!flag){
		ShowAlert(_alertTitle, "请选择您要订阅的周刊");
		return false;
	}else{
		var action = document.getElementById('action');
		if(n == 1){ //订阅
			action.value = 'feed';
		}else{
			action.value = 'qfeed';
		}
		var formemail = document.getElementById('formemail');
		formemail.submit();
	}
}

function chkinput(){
	if(document.getElementById("SysUsername").value == ""){
	   alert("请输入用户昵称！");   
	   form.SysUsername.focus();
	   return false;
	}
				 
	if(document.getElementById("SysPassword").value == ""){
	   alert("请输入注册密码！");   
	   form.SysPassword.focus();
	   return false;
	}

	var formlogin = document.getElementById('formlogin');
	formlogin.submit();
}
function siteLogin(){
	if(document.getElementById('SysUsername').value == ''){
	   ShowAlert(_alertTitle, '请输入用户昵称！');   
	   form.SysUsername.focus();
	   return false;
	}
				 
	if(document.getElementById('SysPassword').value == ''){
	   ShowAlert(_alertTitle, '请输入注册密码！');   
	   form.SysPassword.focus();
	   return false;
	}

	var formlogin = document.getElementById('formlogin');
	formlogin.submit();
	return true;
}