JQUERY SELECT에서 선택하자 마자 바로 액션발생시 처리하는 루틴

=============================JS=========================

$(document).ready(function(){

$('#page_limit').val('<?php echo $page_limit; ?>');

$('#search_text').val('<?php echo $search_text; ?>');

$('#search_type2').val('<?php echo $search_type2; ?>');

$("#page_limit").change(function(){

$("form[name=page_form] input[name=page_limit]").val($(this).val());

//alert($("form[name=page_form] input[name=page_limit]").val());

gopage('0');

});

$("#search_type2").change(function(){

$("form[name=page_form] input[name=search_type2]").val($(this).val());

//alert($("form[name=page_form] input[name=page_limit]").val());

gopage('0');

});

});

function gopage(page_idx){

//alert(page_idx);

document.page_form.page.value=page_idx;

document.page_form.submit();

}

=============================HTML=========================

<form name="page_form" method="POST">

<input type='hidden' name="search_text" value="<?=$search_text?>"> 

<input type='hidden' name="search_type2" value="<?=$search_type2?>"> 

<input type='hidden' name="page_limit" value="<?=$page_limit?>"> 

<input type='hidden' name="page" value="<?=$page?>">

</form>

<td bgcolor="#FFFFFF" class="in_th th_color">한페이지당목록수</td>

<td>

<select id='page_limit' name='page_limit' style='width: 80px'>

<option value='10' selected>10</option>

<option value='30'>30</option>

<option value='50'>50</option>

       </select>

</td>

<td class="in_th th_color">담보비율</td>

<td>

<select name='search_type2' id='search_type2' style='width: 120px'>

<option value='1' selected>전체</option>

<option value='2'>130%이상</option>

<option value='3'>130%이하</option>

      </select>

</td>