// JavaScript Document

function checkform(form){
// Email 50
  if(form.Email.value=='')
  {alert("账号不能为空,要填写!");
  form.Email.focus();
  return false;
  }
  if(form.Email.value!=''&&checkemail(form.Email.value))
  {alert("账号输入有错误！");
  form.Email.focus();
  return false;
  }
  if(form.Email.value!=''&&form.Email.value.length>250)
  {alert("账号字数超过了250个！");
  form.Email.focus();
  return false;
  }
  return true;
 }