function switchtheme(theme)
{
    if ($('sign'+theme).innerHTML == '[+]')
    {
        var url = '/shop/ajax/cat/open';
        var pars = 'cat=' + theme;
        $('sign'+theme).innerHTML = '[-]';
        theme_name = 'shcat'+theme;
        var myAjax = new Ajax.Request( url, { method: 'post', asynchronous: false, parameters: pars, onComplete: openThemeDo}); 
        $('shcat'+theme).runtimeStyle.display = 'block';
    }
    else
    {
        $('sign'+theme).innerHTML = '[+]';
        $('shcat'+theme).innerHTML = '';
        $('shcat'+theme).runtimeStyle.display = 'none';
    }
}

function openThemeDo(originalRequest)
{
    $(theme_name).innerHTML = originalRequest.responseText;
}