function check()
{
if (document.forms[0].UserName.value.length<=0)
{
alert("请输入你的姓名");document.forms[0].UserName.focus();return false;
}
else if (document.forms[0].EMail.value.length<=0)
{
alert("请输入你的e-mail ");document.forms[0].EMail.focus();return false;
}
else if (document.forms[0].EMail.value.indexOf("@") == -1 &
document.forms[0].EMail.value.indexOf(".") == -1)
{ alert("请输入正确的e-mail");document.forms[0].EMail.focus();return false;
}
else if (document.forms[0].Organization.value.length<=0)
{
alert("请输入你的公司名称");document.forms[0].Organization.focus();return false;
}
else if (document.forms[0].Requirement.value.length<=0)
{
alert("请输入你的想法和建议");document.forms[0].Requirement.focus();return false;
}

else if (document.forms[0].Tel.value.length<=0)
{
alert("请输入你的联系电话");document.forms[0].Tel.focus();return false;
}
document.forms[0].Reference.value = document.referrer;
return true;
}