/********** Show/Hide block **********/
function showFeatureDetails(sender, id) {

    var obj = document.getElementById(id);
    
    if (obj.style.display != 'none') {
        obj.style.display = 'none';
        sender.style.backgroundPosition = '0 0';
    }
    else {
        obj.style.display = 'block';
        sender.style.backgroundPosition = '0 35px';
    }
}