function revealModal(divID)
{
window.onscroll = function () { document.getElementById("modalBackground").style.top = document.body.scrollTop; };
document.getElementById(divID).style.display = "block";
}

function hideModal(divID)
{
document.getElementById(divID).style.display = "none";
}

function showServer(serverID)
{
    //vytvoreni nove promenne
    var request = null;
    //gecko
    if( window.XMLHttpRequest ){
        request = new XMLHttpRequest()
    }
    else if ( window.ActiveXObject ){
        //IE
        request = new ActiveXObject("Microsoft.XMLHTTP");
    }
    //pokud se neporadilo vytvorit 
    if (!request) {
         alert('nejede a nepojede');
         return false;
    }
      
    request.onreadystatechange = function () {go(request); } ;
    request.open("GET", "sinfo.php?server=" + serverID, true);
    request.send( null );
}

function go( request ){
    var txt;
    if (request.readyState == 4){
        if(request.status == 200 || request.status == 0){
            txt=request.responseText;
            document.getElementById('SdetDiv').innerHTML = txt ;
            revealModal('modalPage');
        }
    }
}