function checkorder(){
	if(document.frmAnnounce.title.value==""){
		alert("留言主题不能为空，请填写！");
		document.frmAnnounce.title.focus();
		return false;
	}
	if(document.frmAnnounce.usercontent.value==""){
		alert("留言内容不能为空，请填写！");
		document.frmAnnounce.usercontent.focus();
		return false;
	}
	if(document.frmAnnounce.name.value==""){
		alert("请填写联系人姓名！");
		document.frmAnnounce.name.focus();
		return false;
	}
	if(!isEmail(document.frmAnnounce.email.value)){
		alert("请填写常用的电子邮件，请注意邮件格式");
		document.frmAnnounce.email.focus();
		return false;
	}
		var filter=/(\+86)?(\d{3}-|\d{4}-)?(\d{8}|\d{7}){1,}/;
		if (!filter.test(document.frmAnnounce.phone.value)){
			alert("联系电话格式有错！");
			document.frmAnnounce.phone.focus();
			return false;
		}
	if(document.frmAnnounce.address.value==""){
		alert("请填写企业地址");
		document.frmAnnounce.address.focus();
		return false;
	}
	document.frmAnnounce.submit()
}