function chkemail(a) 
      {
	    var i=a.length;
        var temp = a.indexOf('@');
        var tempd = a.indexOf('.');
       if (temp >= 1) {
         if ((i-temp) > 3){
            if ((i-tempd)>0){
                  return 1;
              }         
        }
      }
     return 0;
    }
function checkaddbbs(theForm)
{
  if (theForm.username.value == "")
  {
    alert("温馨小提示：姓名不能为空");
    theForm.username.focus();
    return (false);
  }
     if (theForm.email.value == ""||chkemail(theForm.email.value)==0)
  {
    alert("温馨小提示：请在次输入正确Email。");
    theForm.email.focus();
    return (false);
  }
  if (theForm.phone.value == "")
  {
    alert("温馨小提示：请输入联系人！");
    theForm.phone.focus();
    return (false);
  }
    if (theForm.content.value == "")
  {
    alert("温馨小提示：请输入留言内容！");
    theForm.content.focus();
    return (false);
  }
    return (true);
}