<form action="order_add_data.php" method="post" name="order_adds">

..........

<input type="submit" class="submit" id='fk_submit' value="提交添加" size="10"  onclick="return check_input();"/>

</form>

     function check_input (){

         var order_num=$("#order_num").val();

         var dinghuo=$("#dinghuo").val();

         var dinghuo_tel=$("#dinghuo_tel").val();

         var shouhuo=$("#shouhuo").val();

         var shouhuo_tel=$("#shouhuo_tel").val();

         var songhuo_addr=$("#songhuo_addr").val();

         var shangpin=$("#shangpin").val();

         var shuliang=$("#shuliang").val();

         if (order_num==""||dinghuo==""||dinghuo_tel==""||shouhuo==""||shouhuo_tel==""||songhuo_addr==""||shangpin==""||shuliang=="")

         {

         alert("带*不能为空！");

         return false;

         }else{
　　　　　　　//验证通过后：执行如下代码

            document.order_adds.submit();

            $("#fk_submit").attr('disabled',true);

            return false;

         }