function f_validate_form() {
    var form_prod = document.forms["submitForm"]["form_prod"].value;
    var form_model = document.forms["submitForm"]["form_model"].value;
    var form_sit = document.forms["submitForm"]["form_sit"].value;
    var form_capacity = document.forms["submitForm"]["form_capacity"].value;
    var form_transmission = document.forms["submitForm"]["form_transmission"].value;
    var form_year = document.forms["submitForm"]["form_year"].value;
    var form_reg_year = document.forms["submitForm"]["form_reg_year"].value;
    var form_int_color_code = document.forms["submitForm"]["form_int_color_code"].value;
    var form_ext_color_code = document.forms["submitForm"]["form_ext_color_code"].value;
    var form_no_of_owner = document.forms["submitForm"]["form_no_of_owner"].value;
    var form_mileage = document.forms["submitForm"]["form_mileage"].value;
    var form_license_expire_date = document.forms["submitForm"]["form_license_expire_date"].value;
    var form_name = document.forms["submitForm"]["form_name"].value;
    var form_contact_method =  $("input[name='form_contact_method']:checked").val();
    var form_contact_detail = document.forms["submitForm"]["form_contact_detail"].value;
	
	    	var form_price = document.forms["submitForm"]["form_price"].value;
    	
    var d = new Date();

    if (form_model == null || form_model == "") {
        alert("請填寫車款");
        return false;
    }
	
	/*
    if (form_sit == null || form_sit == "") {
        alert("請填寫座位數目");
        return false;
    } else if (!f_checkInteger(form_sit)) {
        alert("座位數目必需是數字");
        return false;
    } else if (f_checkIsGreaterThan(form_sit, 16)) {
        alert("座位不應該大過16座");
        return false;
    }
	*/
	/*
    if (form_capacity == null || form_capacity == "") {
        alert("請填寫容積");
        return false;
    } else if (!f_checkInteger(form_capacity)) {
        alert("容積必需是數字");
        return false;
    } else if (f_checkIsGreaterThan(form_capacity, 100000)) {
        alert("容積不應該大過100000cc");
        return false;
    }
	*/
    if (form_year == null || form_year == "") {
        alert("請填寫製造年份");
        return false;
    } else if (!f_checkInteger(form_year)) {
        alert("製造年份必需是數字");
        return false;
    } else if (f_checkIsGreaterThan(form_year, d.getFullYear())) {
        alert("製造年份不應該大過" + d.getFullYear() + ".");
        return false;
    }

    if (form_reg_year == null || form_reg_year == "") {
        alert("請填寫登記年份");
        return false;
    } else if (!f_checkInteger(form_reg_year)) {
        alert("登記年份必需是數字");
        return false;
    } else if (f_checkIsGreaterThan(form_reg_year, d.getFullYear())) {
    	alert("登記年份不應該大過" + d.getFullYear() + ".");
        return false;
    }
	/*
    if (form_int_color_code == null || form_int_color_code == "") {
        alert("請填寫內部顏色");
        return false;
    }

    if (form_ext_color_code == null || form_ext_color_code == "") {
    	alert("請填寫外部顏色");
        return false;
    }
	*/
	/*
	if (form_no_of_owner == null || form_no_of_owner == "") {
        //alert("請填寫車輛轉手數目");
        //return false;
    } else if (!f_checkInteger(form_no_of_owner)) {
        alert("車輛轉手數目必需是數字");
        return false;
    } else if (f_checkIsGreaterThan(form_no_of_owner, 99)) {
    	alert("車輛轉手數目不應該大過 99.");
        return false;
    }
	*/
	/*
    if (form_mileage == null || form_mileage == "") {
    	alert("請填寫行走里數");
        return false;
    } else if (!f_checkInteger(form_mileage)) {
    	alert("行走里數必需是數字");
        return false;
    }
    */
    /*
    if (form_license_expire_date == null || form_license_expire_date == "") {
    	//alert("請填寫牌費到期日");
        //return false;
    } else if (!f_isDate(form_license_expire_date)){
    	alert("牌費到期日格式必需是 YYYY-MM-DD.");
       return false;
    }
	*/
	
    if (form_name == null || form_name == "") {
    	alert("請填寫聯絡人姓名");
        return false;
    }
	
    if (form_contact_method == 'P') {
        if (form_contact_detail == null || form_contact_detail == '') {
        	alert("請填寫手提號碼");
            return false;
        } else if (!f_checkInteger(form_contact_detail)) {
        	alert("手提號碼必需是數字");
            return false;
        } else if (!f_checkLength(form_contact_detail, 0) && !f_checkLength(form_contact_detail, 8)) {
        	alert("手提號碼必需是八位數字");
            return false;
       }
    }  
	
    if (form_contact_method == 'E') {
        if (form_contact_detail == null || form_contact_detail == '') {
        	alert("請填寫電郵地址");
            return false;
        } else if (!f_checkIsValidEmail(form_contact_detail)) {
        	alert("電郵地址不正確");
            return false;  
		}
	}
	
	/*
    if (form_price == null || form_price == "") {
    	alert("請填寫售價");
        return false;
    } else if (!f_checkInteger(form_price)) {
    	alert("售價必需是數字");
        return false;
    }
	*/
    return true;
}