function showlayer() {
  
  //alert('go');
  
    try {
        var layerbackground = document.getElementById('layer_background');
        var layercontent = document.getElementById('layer_content');
        var arrayPageSize = getPageSize();
        var arrayPageScroll = getPageScroll();
        var ptop = arrayPageScroll[1] + ((arrayPageSize[3] - 281 - 200) / 2);
        var pleft = ((arrayPageSize[0] - 800 - 20) / 2);

        layercontent.style.top = (ptop < 0) ? '0px' : ptop + 'px';
        layercontent.style.left = (pleft < 0) ? '0px' : pleft + 'px';
        layercontent.style.display = 'block';

        layerbackground.style.display = 'block';
        layerbackground.style.height = arrayPageSize[1] + 'px';
    }
    catch (e) {
        //    alert(e);
    }

    return false;
}

function hidelayer() {
    try {
        var layerbackground = document.getElementById('layer_background');
        var layercontent = document.getElementById('layer_content');

        layercontent.style.display = 'none';
        layerbackground.style.display = 'none';
    }
    catch (e) {
        //    alert(e);
    }

    return false;
}




function toggleDoz(elem) {
    if (elem.className == "head_c") {
        elem.className = "head_o";
        elem.nextSibling.nextSibling.style.display = "block";
    } else {
        elem.className = "head_c";
        elem.nextSibling.nextSibling.style.display = "none";
    }
}