function dl_image_size_check( lng ){
  var radioObjValue;
  if( document.dl_pic_form.dl_var.length == undefined) if( document.dl_pic_form.dl_var.checked ) radioObjValue = document.dl_pic_form.dl_var.value; else radioObjValue = "";
  for(var i = 0; i < document.dl_pic_form.dl_var.length; i++) {
    if(document.dl_pic_form.dl_var[i].checked) {
      radioObjValue = document.dl_pic_form.dl_var[i].value;
    }
  }

  if( radioObjValue > 0 ){
    document.dl_pic_form.submit();
  } else {
    switch( lng ){
      case "cz":
        alert( "Není vybrána velikost fotografie ke stažení" );    
      break;
      case "en":
        alert( "Please choose an image size/use for download" );    
      break;
    }
  }

}

function checkAll(){
    for (var i=0;i<document.search_form.elements.length;i++)
    {
      var e = document.search_form.elements[i];
      var boolValue = document.search_form.selectAll.checked;
      if (e.name == 'search_kat[]')
	    {
        e.checked = boolValue;
	    }
    }
}

function getStyleObject(objectId) {
  // cross-browser function to get an object's style object given its id
  if(document.getElementById && document.getElementById(objectId)) {
    // W3C DOM
    return document.getElementById(objectId).style;
  } else if (document.all && document.all(objectId)) {
    // MSIE 4 DOM
    return document.all(objectId).style;
  } else if (document.layers && document.layers[objectId]) {
    // NN 4 DOM.. note: this won't find nested layers
    return document.layers[objectId];
  } else {
    return false;
  }
} // getStyleObject

function changeObjectVisibility(objectId, newVisibility) {
  // get a reference to the cross-browser style object and make sure the object exists
  var styleObject = getStyleObject(objectId);
  if(styleObject) {
    styleObject.visibility = newVisibility;
    return true;
  } else {
    // we couldn't find the object, so we can't change its visibility
    return false;
  }
} // changeObjectVisibility

function moveObject(objectId, newXCoordinate, newYCoordinate) {
  // get a reference to the cross-browser style object and make sure the object exists
  var styleObject = getStyleObject(objectId);
  if(styleObject) {
    styleObject.left = newXCoordinate;
    styleObject.top = newYCoordinate;
    return true;
  } else {
    // we couldn't find the object, so we can't very well move it
    return false;
  }
} // moveObject

var xOffset = 15;
var yOffset = -5;

function showPopup (targetObjectId, eventObj) {
  if(eventObj) {
    // hide any currently-visible popups
    hideCurrentPopup();
    // stop event from bubbling up any farther
    eventObj.cancelBubble = true;
    // move popup div to current cursor position 
    // (add scrollTop to account for scrolling for IE)
    var newXCoordinate = (eventObj.pageX)?eventObj.pageX + xOffset:eventObj.x + xOffset + ((document.body.scrollLeft)?document.body.scrollLeft:0);
    var newYCoordinate = (eventObj.pageY)?eventObj.pageY + yOffset:eventObj.y + yOffset + ((document.body.scrollTop)?document.body.scrollTop:0);
    moveObject(targetObjectId, newXCoordinate, newYCoordinate);
    // and make it visible
    if( changeObjectVisibility(targetObjectId, 'visible') ) {
      // if we successfully showed the popup
      // store its Id on a globally-accessible object
      window.currentlyVisiblePopup = targetObjectId;
      return true;
    } else {
      // we couldn't show the popup, boo hoo!
      return false;
    }
  } else {
    // there was no event object, so we won't be able to position anything, so give up
    return false;
  }
} // showPopup

function hideCurrentPopup() {
  // note: we've stored the currently-visible popup on the global object window.currentlyVisiblePopup
  if(window.currentlyVisiblePopup) {
    changeObjectVisibility(window.currentlyVisiblePopup, 'hidden');
    window.currentlyVisiblePopup = false;
  }
} // hideCurrentPopup

// initialize hacks whenever the page loads
window.onload = initializeHacks;

// setup an event handler to hide popups for generic clicks on the document
document.onclick = hideCurrentPopup;

function initializeHacks() {
  // this ugly little hack resizes a blank div to make sure you can click
  // anywhere in the window for Mac MSIE 5
  if ((navigator.appVersion.indexOf('MSIE 5') != -1) && (navigator.platform.indexOf('Mac') != -1) && getStyleObject('blankDiv')) {
    window.onresize = explorerMacResizeFix;
  }
  resizeBlankDiv();
  // this next function creates a placeholder object for older browsers
  createFakeEventObj();
}

function createFakeEventObj() {
  // create a fake event object for older browsers to avoid errors in function call
  // when we need to pass the event object to functions
  if (!window.event) {
    window.event = false;
  }
} // createFakeEventObj

function resizeBlankDiv() {
  // resize blank placeholder div so IE 5 on mac will get all clicks in window
  if ((navigator.appVersion.indexOf('MSIE 5') != -1) && (navigator.platform.indexOf('Mac') != -1) && getStyleObject('blankDiv')) {
    getStyleObject('blankDiv').width = document.body.clientWidth - 20;
    getStyleObject('blankDiv').height = document.body.clientHeight - 20;
  }
}

function explorerMacResizeFix () {
    location.reload(false);
}