function checkForm() {
	area = document.zb_new_input.area.value;
	yusuan_start = document.zb_new_input.yusuan_start.value;
	yusuan_end = document.zb_new_input.yusuan_end.value;
	real_name = document.zb_new_input.real_name.value;
	telephone = document.zb_new_input.telephone.value;
	mail = document.zb_new_input.mail.value;
	address = document.zb_new_input.address.value;
	end_date = document.zb_new_input.end_date.value;
	
	if (area.length > 0) {
		if (!isNumeric(area)) {
			alert("面积格式填写错误，请用半角数字正确填写");
			document.zb_new_input.area.focus();
			return;
		}
	}
	
	if (yusuan_start.length > 0) {
		if (!isNumeric(yusuan_start)) {
			alert("预算开始金额格式不正确，请正确填写");
			document.zb_new_input.yusuan_start.focus();
			return;
		}
	}
	
	if (yusuan_end.length > 0) {
		if (!isNumeric(yusuan_end)) {
			alert("预算开始金额格式不正确，请正确填写");
			document.zb_new_input.yusuan_end.focus();
			return;
		}
	}
		
	if (real_name.length == 0) {
		alert("姓名不能为空，请填写");
		document.zb_new_input.real_name.focus();
		return;
	}
	
	if (telephone.length == 0) {
		alert("电话号码不能为空，请填写");
		document.zb_new_input.telephone.focus();
		return;
	}
	
	if (!isTelephone(telephone)) {
		alert("电话号码格式填写不正确，请正确填写");
		document.zb_new_input.telephone.focus();
		return;
	}
	
	if (!CheckEmail(mail)) {
		alert("Mail地址填写错误，请正确填写");
		document.zb_new_input.mail.focus();
		return;
	}
	
	if (address.length == 0) {
		alert("地址不能为空，请填写");
		document.zb_new_input.address.focus();
		return;
	}
	
	if (end_date.length > 0) {
		if (!isYYMMDDString(end_date)) {
			alert("招标结束时间格式填写不正确，请正确填写");
			document.zb_new_input.end_date.focus();
			return;
		}
	}
	
	document.zb_new_input.submit();
}