function CheckForm()
{
if (form1.title.value.length==0)
	{
		alert("请输入联系主题！");
		form1.title.focus();
		return false;
	}
if (form1.content.value.length==0)
	{
		alert("请输入联系内容！");
		form1.content.focus();
		return false;
	}
if(form1.email.value.length==0)
   {
		alert("请输入您的电子邮件地址！");
		form1.email.focus();
		return false;
	}
if(form1.email.value!="")
  {
	   if(!isEmail(form1.email.value))
	   {
			alert("请输入正确的电子邮件格式!");
			form1.email.focus();
			return false;
		}
	}
   return true;
  }
function isEmail(vEMail)
{
	var regInvalid=/(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/;
	var regValid=/^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/;
	return (!regInvalid.test(vEMail)&&regValid.test(vEMail));
}