function validate_checkboxes(field){
	var valid = false;
	
	for (i = 0; i < field.length; i++) {
			if (field[i].checked == true) {
				 valid = true;
			}
	}
	
	if (valid == false) {
		 alert('Nothing is selected!');
		 return false;
	} else {
		 return true;
	}
}	

function hide_details(){
	var httpRequest;
	
	if (window.XMLHttpRequest) httpRequest = new XMLHttpRequest();
	else if (window.ActiveXObject) httpRequest = new ActiveXObject('Msxml2.XMLHTTP');
	
	httpRequest.open('GET', 'set_session_var.php?var=details&val=0', true);
	
	httpRequest.onreadystatechange = function (evt) {
		if (httpRequest.readyState == 4) {
		}
	};
	
	httpRequest.send(null);
	
	document.getElementById('exif_data').style.display = 'none';
	document.getElementById('exif_toggle').innerHTML = '<a accesskey="d" href="javascript:void(0);" onclick="show_details();">Toon details</a>';
}

function show_details(){
	var httpRequest;
	
	if (window.XMLHttpRequest) httpRequest = new XMLHttpRequest();
	else if (window.ActiveXObject) httpRequest = new ActiveXObject('Msxml2.XMLHTTP');
	
	httpRequest.open('GET', 'set_session_var.php?var=details&val=1', true);
	
	httpRequest.onreadystatechange = function (evt) {
		if (httpRequest.readyState == 4) {
		}
	};
	
	httpRequest.send(null);
	
	document.getElementById('exif_data').style.display = '';
	document.getElementById('exif_toggle').innerHTML = '<a accesskey="d" href="javascript:void(0);" onclick="hide_details();">Hide details</a>';
}

function display_overlay(img, content) {

	// change position of overlay div
	// move to upper left hand corner of image
	
	// only display overlay if more than one comment
	if (parseInt(content) > 0) {
		var position = getElementPosition(img);

		var top_pos = position.top;
		var left_pos = position.left;

		var overlay = document.getElementById('overlay');
		overlay.style.visibility = 'hidden';
		overlay.innerHTML = content;
		overlay.style.left = left_pos + "px";
		overlay.style.top = top_pos + "px";
		overlay.style.visibility = 'visible';
		overlay.style.zIndex = document.getElementById(img).zIndex + 1;
	}

}

function getElementPosition(elemID) {
	var offsetTrail = document.getElementById(elemID);
	var offsetLeft = 0;
	var offsetTop = 0;
	while (offsetTrail) {
		offsetLeft += offsetTrail.offsetLeft;
		offsetTop += offsetTrail.offsetTop;
		offsetTrail = offsetTrail.offsetParent;
	}
	if (navigator.userAgent.indexOf("Mac") != -1 && 
		typeof document.body.leftMargin != "undefined") {
		offsetLeft += document.body.leftMargin;
		offsetTop += document.body.topMargin;
	}
	return {left:offsetLeft, top:offsetTop};
}


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