$(function(){
$('#btn_search_submit').on('click', function(e){
var $this = $( this );
var link = $this.attr( 'href' );
var str_search = $('#f_k_search').val();
if( str_search!='' ){
link += '&s=' + encodeURIComponent( str_search );
}
document.location.href = link;
});
$('#f_k_search').on('keypress', function(e){
var key = e.which;
if( key == 13 ){ // enter key
$('#btn_search_submit').click();
return false;
}
});
});