function hide_select_options(select_id,hide_show_link_id,all_options,hide_value_list) {
    show_select_options(select_id,hide_show_link_id,all_options);
    
    for (option in hide_value_list) {
        if (hide_value_list[option] != selected_item_value) {
            $(select_id).removeOption(hide_value_list[option]);
        }
    }
    
    $(select_id).selectOptions(selected_item_value);
    
    // add show link
    $(hide_show_link_id).text("Show used images");
    $(hide_show_link_id).attr("href","javascript:show_select_options('"+select_id+"','"+hide_show_link_id+"',all_options)");
}

function show_select_options(select_id,hide_show_link_id,all_options) {
    $(select_id).removeOption(/./);
    $(select_id).addOption(all_options, false);
    
    $(select_id).selectOptions(selected_item_value);
    
    // add hide link
    $(hide_show_link_id).text("Hide used images");
    $(hide_show_link_id).attr("href","javascript:hide_select_options('"+select_id+"','"+hide_show_link_id+"',all_options,hide_items)");
}

function onSelectChange(){   
    var selected = $("#item_image option:selected");        
    var output = "";   
    if(selected.val() != 0){   
        output = "<img src='../catalog_images/100_" + selected.val() + "' alt='' />";
    }   
    $("#output").html(output);   
}