var minFrameHeight = 268;
var maxFrameHeight = 521;
var areDetailsShown = 1;

/**
 *  Enlarges iframe after send.
 */ 
function enlargeFrame() {
   document.getElementById("formFrame").style.height = "750px";      
}

/**
 *  Enlarges frame by height of iframe content.
 */ 
function enlargeFrameByContent() {
  var f = document.getElementById("formFrame");
  var h = f.contentWindow.document.body.scrollHeight;  
  f.contentWindow.document.body.style.overflow = "hidden";
  //console.log(h);  
  f.style.height = (h+0) + "px";
  //console.log(f.style.height);      
}

/**
 *  Shows/hides form details.
 */ 
function showHideDetails() {  
  var dt = document.getElementById("detailsTable");
  var detailLink = document.getElementById("detailLink");   
  //document.getElementById('formFrame').contentDocument.body.innerHeight = "20px";

  if (areDetailsShown == 0) {
    dt.style.display = '';
    parent.document.getElementById('formFrame').style.height = maxFrameHeight+"px";
    detailLink.innerHTML = "Základné vyhľadávanie";
    areDetailsShown = 1;
  }
  else {
    dt.style.display = 'none';
    parent.document.getElementById('formFrame').style.height = minFrameHeight+"px";    
    detailLink.innerHTML = "Rozšírené vyhľadávanie";
    areDetailsShown = 0;
  }  
  var f = parent.document.getElementById("formFrame");
  var h = f.contentWindow.document.body.scrollHeight;  
  f.contentWindow.document.body.style.overflow = "hidden";
  f.style.height = (h+0) + "px";
}