function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function fnShowPicture(url) {
  window.open("./pop.picture.php?src="+url,"","location=no,menubar=no,status=no,titlebar=no,toolbar=no");
}

function getURLParam(strParamName){
  var strReturn = '';
  var strHref = window.location.href;
  if ( strHref.indexOf('?') > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf('?')).toLowerCase();
    var aQueryString = strQueryString.split('&');
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if (aQueryString[iParam].indexOf(strParamName + '=') > -1 ){
        var aParam = aQueryString[iParam].split('=');
        strReturn = aParam[1];
        break;
      }
    }
  }
  return strReturn;
}

/*function makePOSTRequest(url, parameters) {
   http_request = false;
   if (window.XMLHttpRequest) { // Mozilla, Safari,...
      http_request = new XMLHttpRequest();
      if (http_request.overrideMimeType) {
              // set type accordingly to anticipated content type
         http_request.overrideMimeType('text/xml');
         //http_request.overrideMimeType('text/html');
      }
   } else if (window.ActiveXObject) { // IE
      try {
         http_request = new ActiveXObject('Msxml2.XMLHTTP');
      } catch (e) {
         try {
            http_request = new ActiveXObject('Microsoft.XMLHTTP');
         } catch (e) {
           }
      }
   }
   if (!http_request) {
      alert('Cannot create XMLHTTP instance');
      return false;
   }

   http_request.onreadystatechange = alertContents;
   http_request.open('POST', url, true);
   http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
   http_request.setRequestHeader("Content-length", parameters.length);
   http_request.setRequestHeader("Connection", "close");
   http_request.send(parameters);
}*/

function makePOSTRequest(url, parameters) {
  http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
    http_request = new XMLHttpRequest();
    if (http_request.overrideMimeType) {
      // set type accordingly to anticipated content type
      http_request.overrideMimeType('text/xml');
      //http_request.overrideMimeType('text/html');
    }
  } else if (window.ActiveXObject) { // IE
    try {
      http_request = new ActiveXObject('Msxml2.XMLHTTP');
    } catch (e) {
      try {
        http_request = new ActiveXObject('Microsoft.XMLHTTP');
      } catch (e) {
      }
    }
  }
  if (!http_request) {
    alert('Cannot create XMLHTTP instance');
    return false;
  }
  alert(parameters);

  http_request.onreadystatechange = alertContents;
  http_request.open('POST', url, true);
  http_request.setRequestHeader("Content-type", "image/jpeg");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}

function alertContents() {
  if (http_request.readyState == 4) {
    if (http_request.status == 200) {
      alert(http_request.responseText);
      result = http_request.responseText;
      document.getElementById('mainImage').src=result;
    }else {
      alert('There was a problem with the request.');
    }
  }
}

function displayImage(id, arrPrev, arrNext, arrAuthor) {
  //var poststr = "type=gMain&file="+id;
  //makePOSTRequest('http://www.driven.ee/createGD.php', poststr);
  document.getElementById('mainImage').src = 'http://www.driven.ee/createGD.php?type=gMain&file='+id;
  document.getElementById('pDescription').innerHTML = arrAuthor[id];
  document.getElementById('leftArrow').onclick = function(){displayImage(arrPrev[id], arrPrev, arrNext, arrAuthor);};
  document.getElementById('rightArrow').onclick = function(){displayImage(arrNext[id], arrPrev, arrNext, arrAuthor);};
  document.getElementById('mainImage').onclick = function(){displayImage(arrNext[id], arrPrev, arrNext, arrAuthor);};
}