Form sumbit focus element

Form sumbit focus element

Dear Friends,

I have a form i need to duplicate all the values i am copying after generating new form with new id the control has to move to one element below is my code..
    var weight=$('#weight').focus();

$('<form></form>')
        .attr('action', 'create_order.php')
        .attr('method', 'post')
        .append($('<input>')
            .attr('name', 'duplicate')       
            .val(orderNumber)
        )
        .appendTo('body')
        .submit();