var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{
			string: navigator.userAgent,
			subString: "Chrome",
			identity: "Chrome"
		},
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari",
			versionSearch: "Version"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();

function fixCheckboxes() {
	function setWrapper(input) {
		var wrapper = document.createElement('div');
		wrapper.className='checkboxWrapper';
		wrapper.style.display='inline-block';
		wrapper.style.position='absolute';
		//wrapper.style.zIndex=2;
		wrapper.style.width='13px';
		wrapper.style.height='15px';
		wrapper.style.backgroundImage = "url('http://www.eijerkamp.nl/graphics/form/checkbox.png')";
		wrapper.refInput = input;
		if (BrowserDetect.browser=='Explorer') { //document.all is not good enough, opera has it also
			
//			if (input.currentStyle.styleFloat) {
				var p = input.offsetParent;
				var leftOffset=0;
				var topOffset=0;
				while (p.currentStyle.position=='static') {
					leftOffset += p.offsetLeft;
					topOffset += p.offsetTop;
					p = p.offsetParent;
				}
				wrapper.style.left = (leftOffset + input.offsetLeft)+'px';
				wrapper.style.top = (topOffset + input.offsetTop)+'px';
//			} else {
//				if (input.currentStyle.left) {
//					wrapper.style.left = input.currentStyle.left;
//				}
//				if (input.currentStyle.top) {
//					wrapper.style.top = input.currentStyle.top;
//				}
//			}
			wrapper.style.marginTop='3px';
			wrapper.style.marginLeft='4px';
		} else {
			wrapper.style.top=input.offsetTop+'px';
			wrapper.style.left=input.offsetLeft+'px';
		}
		input.parentNode.insertBefore(wrapper, input);
		input.style.visibility='hidden';
		//input.style.marginLeft='-20px';
		return wrapper;
	}
	var inputs = document.getElementsByTagName('INPUT');
	var input = null;
	for (var i=inputs.length-1; i>=0; i--) {
		input = inputs[i];
		if (input.type=='checkbox' || input.type=='radio') {
			// wrap the checkbox
			var wrapper = setWrapper(input);
			updateCheckbox(wrapper, input);
			// add listeners for change/click
			var getUpdater = function(wrapper, input) {
				return function() {
					updateCheckbox(wrapper, input);
				}
			}
			var getToggler = function(wrapper, input) {
				return function() {
					toggleCheckbox(wrapper, input);
				}
			}
			if (window.attachEvent) {
				input.attachEvent('onclick', getUpdater(wrapper, input));
				input.attachEvent('onchange', getUpdater(wrapper, input));
			} else {
				input.addEventListener('click', getUpdater(wrapper, input), false);
				input.addEventListener('change', getUpdater(wrapper, input), false);
			}
			wrapper.onclick = getToggler(wrapper, input);
		}
	}
}

function unCheckRadio(input) {
	//FIXME: nee dit is niet netjes, maar het werkt wel
	var wrapper = input.previousSibling;
	wrapper.style.backgroundPosition='0px 0px';
}

function updateCheckbox(wrapper, input) {
	if (input.checked) {
		wrapper.style.backgroundPosition='0px 15px';
		if (input.type=='radio') {
			var form = input.form;
			var inputs = document.getElementsByName(input.name);
			for (var i=inputs.length-1; i>=0; i--) {
				if (inputs[i].form==form) {
					if (inputs[i]!=input) {
						unCheckRadio(inputs[i]);
					}
				}
			}
		}
	} else {
		wrapper.style.backgroundPosition='0px 0px';
	}
}

function toggleCheckbox(wrapper, input) {
	if (input.type=='checkbox' && input.checked) {
		input.checked=0;
	} else {
		input.checked=1;
	}
	updateCheckbox(wrapper, input);
}

function fixLabels(form) {
	var labels = form.getElementsByTagName('LABEL');
	if (labels) {
		for (var i=labels.length-1; i>=0; i--) {
			if (labels[i].className.match(/\b(text|password)\b/)) {
				labels[i].style.position='absolute';
				labels[i].style.marginLeft='7px';
				labels[i].style.textAlign='left';
				labels[i].style.width='auto';
				var input = labels[i].parentNode.getElementsByTagName('INPUT')[0];
				input.onfocus = function(label) {
					return function() {
						label.style.display='none';
					}
				}(labels[i]);
				input.onblur = function(label, input) {
					return function() {
						if (input.value=='') {
							label.style.display='block';
						}
					}
				}(labels[i], input);
				labels[i].onclick = function(label, input) {
					return function() {
						label.style.display='none';
						input.focus();
					}
				}(labels[i], input);
				if (input.value!=='') {
					labels[i].style.display='none';
				}
			}
		}
	}
}

function fixForms() {
	var forms = document.getElementsByTagName('FORM');
	if (forms) {
		for (var i=forms.length-1; i>=0; i--) {
			if (forms[i].className.match(/\b(casLogin|casResetPassword|casDelete|casRegister|eijerkampNewsletter)\b/)) {
				// login form found
				fixLabels(forms[i]);
			}
		}
	}
}

function init() {
	fixCheckboxes();
	fixForms();
}

if (window.attachEvent) {
	window.attachEvent('onload', init);
} else {
	window.addEventListener('load', init, false);
}