function formcheck()
{
  if (document.all.form.name.value=="")
  {
    alert("姓名不能为空！");
	document.form.name.focus();
	return false;
  }
  if (document.all.form.email.value=="")
  {
    alert("邮箱不能为空！");
	document.all.form.email.focus();
	return false;
  }
  if (document.all.form.title.value=="")
  {
    alert("咨询主题不能为空！");
	document.form.title.focus();
	return false;
  }
  if (document.all.form.content.value=="")
  {
    alert("咨询内容不能为空！");
	document.form.content.focus();
	return false;
  }

  /*if (document.all.form.tel.value=="")
  {
    alert("联系电话不能为空！");
	document.all.form.tel.focus();
	return false;
  }*/
 if (document.all.form.content.value.length>2048000)
  {
    alert("文章内容太长，超出了数据库的限制（2048K）！建议您分成几部分录入。");
	document.all.form.content.focus();
	return false;
  }
  return true;  
}

function  check_numeric(eventobject)      //数字鉴定，只有是数字才能输入  
  {       //alert(window.event.keyCode);  //打印键盘的asc码
          if  ((window.event.keyCode  >=  48  &&  window.event.keyCode  <=  57)  ||  (window.event.keyCode  >=  96  &&  window.event.keyCode  <=  105)  ||  (window.event.keyCode  ==  8)  ||  (window.event.keyCode  ==  46)  ||  (window.event.keyCode  ==  37)  ||  (window.event.keyCode  ==  39)  ||  (window.event.keyCode  ==  36)  ||  (window.event.keyCode  ==  35)  ||  (window.event.keyCode  ==  9)  ||  (window.event.keyCode  ==  190) ||  (window.event.keyCode  == 109 ))  
   //只能输入大键盘0~9和小键盘0~9的数字和BACKSPACE、DELETE、左、右、HOME、END、TABLE键  
          {      
                  return  true;  
          }  
   else  
		{  
           return  false;  
		}  
  }