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var winW;
var winH;
if (document.documentElement && document.documentElement.clientWidth) {
	winW = document.documentElement.clientWidth;
	winH = document.documentElement.clientHeight;
} else if (document.body && document.body.clientWidth) {
	winW = document.body.clientWidth;
	winH = document.body.clientHeight;
} else {
	winW = window.innerWidth;
	winH = window.innerHeight;
}
//alert( navigator.appName + " window size is " + winW +" x "+ winH );

var ajax;
var isIE = false;
if (window.XMLHttpRequest) { // branch for native XMLHttpRequest object
	ajax = new XMLHttpRequest();
} else if (window.ActiveXObject) { // branch for IE/Windows ActiveX version
	isIE = true;
	ajax = new ActiveXObject('MSXML2.XMLHTTP.3.0'); // this is what Microsoft recommends for IE5/IE6 (abort() method is not available)
}
if (!ajax) {
  alert("Error initializing XMLHttpRequest!");
}

function getObjectByID(objectId) { // get an object by it's tag ID value
	if (document.getElementById && document.getElementById(objectId)) {
		return document.getElementById(objectId);
	} else if (document.all && document.all(objectId)) {
		return document.all(objectId);
	} else {
		return false;
	}
}
function addslashes(str) {
	str=str.replace(/\'/g,'\\\'');
	return str;
}
function stripslashes(str) {
	str=str.replace(/\\'/g,'\'');
	return str;
}
function trim(myString) {
	return myString.replace(/^\s*|\s*$/g,"");
}

function editComment(comment_div, ctrl_div, filepath) {
	var comment_obj = getObjectByID(comment_div);
	var currentText = comment_obj.innerHTML;
	if (currentText == '' ) currentText = 'put your description here';
	comment_obj.innerHTML = '<textarea name=comments>' + currentText + '<\/textarea>';
	var ctrl_obj = getObjectByID(ctrl_div);
	ctrl_obj.innerHTML = '<a href="javascript:void(0);" onclick="saveComment(\'' + comment_div + '\',\'' + ctrl_div + '\',\'' + filepath + '\')" >[save]<\/a>';
}
function saveComment(comment_div, ctrl_div, filepath) {
	// get the new text
	var comment_obj = getObjectByID(comment_div);
	var textarea_obj = comment_obj.firstChild;
	var currentText = textarea_obj.value;

	// update the comment display
	comment_obj.innerHTML = currentText;

	// update the comment controls
	var ctrl_obj = getObjectByID(ctrl_div);
	ctrl_obj.innerHTML = '<a href="javascript:void(0);" onclick="editComment(\'' + comment_div + '\',\'' + ctrl_div + '\',\'' + filepath + '\')" >[edit]<\/a>';

	// submit the change to the server for saving
	if (!isIE) ajax.abort;
	ajax.open('POST', '?view=ajax');
	ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	ajax.send('cmd=writecomment&filepath=' + filepath +'&comment=' + currentText);
	ajax.onreadystatechange = function () { alertXMLresponse() };
}

function deleteFile(ctrl_div, filepath) {
	var ctrl_obj = getObjectByID(ctrl_div);
	if (confirm('This file will be permanently deleted, are you sure?')) { 
		// submit the change to the server for saving
		if (!isIE) ajax.abort;
		ajax.open('POST', '?view=ajax');
		ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		ajax.send('cmd=deletefile&filepath=' + filepath );
		ajax.onreadystatechange = function () { deleteFileXMLresponse(ctrl_obj) };
	}
}
function deleteFileXMLresponse(ctrl_obj) {
	if(ajax.readyState == 4){ //finished loading the response
		var response = ajax.responseText;
		if ( response != 0) {
			alert( response );
		}else {
			ctrl_obj.parentNode.innerHTML = "<span class='deleted-thumb'>deleted</span>";
		}
	}
}

function shrinkImageToScreen( image ) { // scale an image to fit within the browser window
	var ratio;
	var w = winW -50;
	var h = winH -50;
	if (image.width > image.height) { // landscape format
		if (image.width > w) { // shrink if it is too wide
			ratio = image.width / w;
			image.width = w;
			image.height = Math.round(image.height / ratio);
		}
		if (image.height > h) { // shrink again if it is still too tall
			ratio = image.height / h;
			image.height = h;
			// for some reason the makes vertical portrait images too skinny
			image.width = Math.round(image.width / ratio);
		}
	} else if (image.height > image.width) { // portrait format
		if (image.height > h) { // shrink if it is too tall
			ratio = image.height / h;
			image.height = h;
			// for some reason this makes vertical portrait images too skinny
			image.width = Math.round(image.width / ratio);
		}
		if (image.width > w) { // shrink again if it is still too wide
			ratio = image.width / w;
			image.width = w;
			image.height = Math.round(image.height / ratio);
		}
	}
}

function UpdateAdminControls( view_admin_controls_linkname, state ) {
	var view_admin_controls_link_obj = getObjectByID(view_admin_controls_linkname);
	var rule_position = 0;
	var num_rules = document.styleSheets[0].cssRules.length;
	for (var i=0; num_rules > i; i++ ) {
		if ( 'div.comment-edit' == document.styleSheets[0].cssRules[i].selectorText ) {
			rule_position = i;
		}
	}
	if ( state == 'hide' ) {
		view_admin_controls_link_obj.innerHTML = "show admin controls";
		view_admin_controls_link_obj.href = "javascript:writeCookie('view_admin_controls','show','90','/');UpdateAdminControls('view_admin_controls','show');";
		document.styleSheets[0].cssRules[rule_position].style.setProperty('display','none','')
	} else if ( state == 'show' ) {
		view_admin_controls_link_obj.innerHTML = "hide admin controls";
		view_admin_controls_link_obj.href = "javascript:writeCookie('view_admin_controls','hide','90','/');UpdateAdminControls('view_admin_controls','hide');";
		document.styleSheets[0].cssRules[rule_position].style.setProperty('display','inline','')
	}
}

function readCookie( name ) {
	var cookie_array = document.cookie.split(';');
	for(var i=0; cookie_array.length > i; i++) {
		var cookie = cookie_array[i];
		cookie = trim(cookie);
		var cookie_parts = cookie.split('=');
		var cookie_name = cookie_parts[0];
		var cookie_value = cookie_parts[1];
		if (cookie_name.indexOf(name) == 0) {
			if ( !cookie_value || cookie_value == ' ' || cookie_value == '') {
				return null;
			}else {
				return unescape( cookie_value );
			}
		}
	}
	return null; // cookie was not found
}
function writeCookie( name, value, expires, path ) {
	// name == cookie name
	// value == cookie value
	// expires == number of days until cookie is deleted, when the browser closes if not specified
	// path == the path below which the browser will make this cookie available
	var expireTime = new Date();
	if ( expires ) expires = expires * 1000 * 60 * 60 * 24;
	var expires_date = new Date( expireTime.getTime() + expires );
	document.cookie = name + '=' +escape( value ) + ( ( expires ) ? ';expires=' + expires_date.toGMTString() : '' ) + ( ( path ) ? ';path=' + path : '' );
}
function deleteCookie( name ) {
	if ( readCookie( name ) ) {
		document.cookie = name +'=;path=/;expires=Thu, 01-Jan-1970 00:00:01 GMT';
	}
}

function add_to_cart( filepath, ctrl_link_id ) {
	if (!isIE) ajax.abort;
	ajax.open('POST', '?view=ajax');
	ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	ajax.send('cmd=add_to_cart&filepath=' + filepath );
	ajax.onreadystatechange = function () { alertXMLresponse() };
	
	filepath = addslashes(filepath);
	var obj = getObjectByID(ctrl_link_id);
	obj.href = "javascript:remove_from_cart('"+filepath+"', '"+ctrl_link_id+"');";
	obj.innerHTML = 'remove from cart';
	obj.title = 'remove this picture from your cart';
}
function remove_from_cart( filepath, ctrl_link_id ) {
	if (!isIE) ajax.abort;
	ajax.open('POST', '?view=ajax');
	ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	ajax.send('cmd=remove_from_cart&filepath=' + filepath );
	ajax.onreadystatechange = function () { alertXMLresponse() };
	
	filepath = addslashes(filepath);
	var obj = getObjectByID(ctrl_link_id);
	obj.href = "javascript:add_to_cart('"+filepath+"', '"+ctrl_link_id+"');";
	obj.innerHTML = 'add to cart';
	obj.title = 'put this picture in your cart to buy prints or download it';
}
function empty_cart() {
	if (!isIE) ajax.abort;
	ajax.open('POST', '?view=ajax');
	ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	ajax.send('cmd=empty_cart' );
	ajax.onreadystatechange = function () { alertXMLresponse() };
	window.location.reload();
}
function add_all_to_cart( path ) {
	if (!isIE) ajax.abort;
	ajax.open('POST', '?view=ajax');
	ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	ajax.send('cmd=add_all_to_cart&dir='+path );
	ajax.onreadystatechange = function () { alertXMLresponse() };
	window.location.reload();
}
function alertXMLresponse() {
	if(ajax.readyState == 4){ //response from webserver has finished loading
		var response = ajax.responseText;
		if ( response != 0) {
			alert( response );
		}
	}
}