function checkform()
{
	if(form1.title.value=="")
	{
		alert('请您填写咨询标题');
		form1.title.focus();
		return false;
	}
	if (form1.title.value.length>100)
	{
		alert('您填写的标题超过100个字符');
		form1.title.focus();
		return false;
	}
	if(form1.neirong.value=="")
	{
		alert('请您填写咨询内容');
		form1.neirong.focus();
		return false;
	}
	if (form1.name.value=="")
	{
		alert('请您填写联系人');
		form1.name.focus();
		return false;
	}
	if ((form1.tel.value=="") && (form1.email.value=="") && (form1.qq.value=="") && (form1.msn.value=="") && (form1.skype.value==""))
	{
		alert('请您至少填写一种联系方式');
		form1.tel.focus();
		return false;
	}
	if (form1.email.value != "")
	{
    if(form1.email.value.charAt(0)=="." ||        
       form1.email.value.charAt(0)=="@"||       
       form1.email.value.indexOf("@", 0) == -1 || 
       form1.email.value.indexOf(".", 0) == -1 || 
       form1.email.value.lastIndexOf("@")==form1.email.value.length-1 || 
       form1.email.value.lastIndexOf(".")==form1.email.value.length-1)
	 {
       alert("您填写的邮箱格式不正确");
       form1.email.focus();
       return false;
      }
	}
return true;
}