use of .size() and don't work in my project?

Did you can help me that why don't work following code in my project?

My project: see this link -> please go to select box or input box and select or typed value.

var length_pa = $('#pagination a').size();
    if(length_pa >= 16){
        $('#prev_pag, #next_pag').show();
        $('#pagination').css('float','left')
   开发者_如何学C }else{
        $('#prev_pag, #next_pag').hide();
    }
    if(length_pa == 0){
        alert('0000000000')
        $('#hesar_number').hide();//.css('display','none');
    } 

EDITE: Sorry, my mistake in typing the code here. Now What is cause problem?

---

 $('#hesar_number')hide();

should be:

 $('#hesar_number').hide();

And you don't have an element with ID clock which is throwing another error in show

---

There's a typo in your JS, which is killing the script:

    $('#hesar_number')hide();//.css('display','none');
                      ^--- missing a .

Absolutely ANYTIME you are working with Javascript and run into trouble, check your browser's JS console (shift-ctrl-J usually). This error would've jumped right out at you if you had.