//留言板输入检测函数
function checkboard()
{
   if(checkspace(document.fkinfo.fksubject.value)) {
	document.fkinfo.fksubject.focus();
    alert("您没有填写主题！");
	return false;
  }
     if(checkspace(document.fkinfo.fkcontent.value)) {
	document.fkinfo.fkcontent.focus();
    alert("请填写反馈信息内容！");
	return false;
  }
     if(checkspace(document.fkinfo.verify.value)) {
	document.fkinfo.verify.focus();
    alert("请填写验证码！");
	return false;
  }

  if(document.fkinfo.fkemail.value.length!=0)
  {
    if (document.fkinfo.fkemail.value.charAt(0)=="." ||        
         document.fkinfo.fkemail.value.charAt(0)=="@"||       
         document.fkinfo.fkemail.value.indexOf('@', 0) == -1 || 
         document.fkinfo.fkemail.value.indexOf('.', 0) == -1 || 
         document.fkinfo.fkemail.value.lastIndexOf("@")==document.fkinfo.fkemail.value.length-1 || 
         document.fkinfo.fkemail.value.lastIndexOf(".")==document.fkinfo.fkemail.value.length-1)
     {
      alert("Email地址格式不正确！");
      document.fkinfo.fkemail.focus();
      return false;
      }
   }
 else
  {
   alert("Email不能为空！");
   document.fkinfo.fkemail.focus();
   return false;
   }
}
function checkspace(checkstr) {
  var str = '';
  for(i = 0; i < checkstr.length; i++) {
    str = str + ' ';
  }
  return (str == checkstr);
}