/**
 * Browser detection.
 */
IS_SAFARI = navigator.userAgent.toLowerCase().indexOf("safari") != -1 ||
	navigator.userAgent.toLowerCase().indexOf("konqueror") != -1;
IS_SAFARI_OLD = false;
if (IS_SAFARI) {
	var matches = navigator.userAgent.match(/AppleWebKit\/(\d+)/);
	if(matches) IS_SAFARI_OLD = parseInt(matches[1]) < 420;
}
IS_OPERA = navigator.userAgent.toLowerCase().indexOf("opera") != -1;
IS_GECKO = !IS_SAFARI && navigator.userAgent.toLowerCase().indexOf("gecko") != -1;
IS_IE = document.all && !IS_OPERA;


/**
 * Get one or more nodes based on string id.
 */
function $(element) {
	if (arguments.length > 1) {
		for (var i = 0, elements = [], length = arguments.length; i < length; i++)
			elements.push($(arguments[i]));
		return elements;
	}
	if (typeof element == 'string')
		element = document.getElementById(element);
	return element;
}

/**
 * Convert a collection into an array.
 */
function $A(iterable) {
	if (!iterable) return [];
	if (iterable.toArray) return iterable.toArray();
	else {
		var results = [];
		for (var i = 0, length = iterable.length; i < length; i++)
			results.push(iterable[i]);
		return results;
	}
}

/**
 * Get the value of a form element.
 */
function $F(element) {
	element = $(element);
	switch (element.tagName.toLowerCase()) {
		case 'input':
			switch (element.type.toLowerCase()) {
				case 'checkbox':
				case 'radio':
					return element.checked ? element.value : null;
				default:
					return element.value;
			}
		case 'textarea':
			return element.value;
		case 'select':
			if (element.multiple) {
				for (var i = 0, values = [], length = element.options.length; i < length; i++) {
					var opt = element.options[i];
					if (opt.selected) values.push(opt.value);
				}
				return values;
			} else {
				return element.options[element.selectedIndex].value;
			}
		default:
			return null;
	}
}

/**
 * Get the words in a string as an array.
 */
function $w(string) {
	return string ? string.replace(/^\s+|\s+$/g, '').split(/\s+/) : [];
}

/**
 * Get all elements with the given class name(s).
 */
function getElementsByClassName(classNames, tag, element){
	var testClass = new RegExp('\\b' + $w(classNames.replace(/\-/, '\\-')).join('\\b|\\b') + '\\b');
	tag = tag || '*'; element = element || document;
	var elements = (tag == '*' && element.all) ? element.all : element.getElementsByTagName(tag);
	var returnElements = [];
	for (var i = 0; i < elements.length; i++){
		if(testClass.test(elements[i].className)){
			returnElements.push(elements[i]);
		}
	}
	return returnElements;
}

function noSubmit(event) {
	if ((event.keyCode || event.charCode) == 13) {
		return false;
	} else {
		return true;
	}
	
}

/**
 * Redraw the visual area.
 */
document.redraw = function () {
	document.body.style.position = 'relative';
	setTimeout(function () { document.body.style.position = ''; }, 0);
}