function checkp (str,pattern) {  return  str.match(pattern); };
function Alert(str) { window.alert(str) ; };
function checkLogin()
{
	    
	var username=document.getElementById('username').value;
	var password=document.getElementById('password').value;
	if(checkp(username,/^[\u0391-\uFFE5A-Za-z0-9_]{2,18}$/)==null)  {Alert('填写用户名') ;  return false; }
	if(checkp(password,/^[A-Za-z0-9_]{6,18}$/)==null)  {Alert('填写密码(6-18位,字母数字)') ;  return false; }
	return true;
}

function checkReg()
{
	if(!document.getElementById('agreement').checked) {Alert('您没有同意注册条款'); return false; }
	var username=document.getElementById('username').value;
	var password=document.getElementById('password').value;
	var repassword=document.getElementById('repassword').value;
	var email=document.getElementById('email').value;

	if(checkp(username,/^[\u0391-\uFFE5A-Za-z0-9_]{2,18}$/)==null)  {Alert('填写用户名') ;  return false; }
	
	if(password!=repassword)  {Alert('密码不一致') ;  return false; }
	if(checkp(password,/^[A-Za-z0-9_]{6,18}$/)==null)  {Alert('填写密码(6-18位,字母数字)') ;  return false; }
	if(checkp(email,/^(.+)@(.+)$/)==null)  {Alert('Email错误') ;  return false; }
	return true;


}

function checkChpass()
{
	var oldpassword=document.getElementById('oldpassword').value;
	var newpassword=document.getElementById('newpassword').value;
	var renewpassword=document.getElementById('renewpassword').value;
	if(checkp(oldpassword,/^[A-Za-z0-9_]{6,18}$/)==null)  {Alert('填写密码(6-18位,字母数字)') ;  return false; }
	if(checkp(newpassword,/^[A-Za-z0-9_]{6,18}$/)==null)  {Alert('填写密码(6-18位,字母数字)') ;  return false; }
	if(checkp(renewpassword,/^[A-Za-z0-9_]{6,18}$/)==null)  {Alert('填写密码(6-18位,字母数字)') ;  return false; }
	return true;

}


function checkActive()
{
	var username=document.getElementById('username').value;
	var email=document.getElementById('email').value;

	if(checkp(username,/^[\u0391-\uFFE5A-Za-z0-9_]{2,18}$/)==null)  {Alert('填写用户名') ;  return false; }
	if(checkp(email,/^(.+)@(.+)$/)==null)  {Alert('Email错误') ;  return false; }
	return true;

}