problem with jquery validation in rails

Hi,

   i am using jquery validation, i used following code

  $("#btn1").click(function(){

  alert("click");
    $("#validating").valid({
      rules: {
        "product_no":{
          required: true
        }
      },
      messages: {
        "product_no":{
          required: "Required"
        }
      }
    }).element( "#bar-div" );
    });

in order to handle validation by particular button i used button id
btn1 and validate will not work
inside button click so i am using valid
1) it is not showing according to rules,message

2) element("#bar-div") is not working, its validating whole form as i
gave :class => :required in all textbox

is that any way to validate particular div with click action of button
for displaying validation messages

thanks,
-pab