jQuery(function(){
	jQuery(function(){
		jQuery('#nav li:last-child a').addClass('last'),jQuery('#nav li:first-child a').addClass('first'), jQuery('.menu li:first-child a').addClass('first');
	})
	initAutoScalingNav({
		menuId: 'nav',
		childTagName: 'a',
		firtsLast: true,
		firstClass: 'first-child',
		lastClass: 'last-child',
		widthShift: 1,
		liWidth: false
	})
});
function initAutoScalingNav(o) {
	if (!o.childTagName) {
		o.childTagName = 'a';
	}
	if (!o.widthShift) {
		o.widthShift = 0;
	}
	if (!o.firstClass) {
		o.firstClass = 'first';
	}
	if (!o.lastClass) {
		o.lastClass = 'last';
	}
	if (!o.widthShiftParent) {
		o.widthShiftParent = 0;
	}
	if (o.mini == 'undefined') {
		o.mini = false;
	}
	if (o.firtsLast == 'undefined') {
		o.firtsLast = true;
	}
	if (o.childFirtsLast == 'undefined') {
		o.childFirtsLast = true;
	}
	if (o.liWidth == 'undefined') {
		o.liWidth = true;
	}
	if (o.menuClass) {
		var _box = document.getElementsByTagName('ul');
		for (var i = 0; i < _box.length; i++) {
			if (_box[i].className.indexOf(o.menuClass) != -1) {
				var _container = _box[i];
				process();
			}
		}
	}
	if (o.menuId) {
		var _boxid = document.getElementById(o.menuId);
		if (_boxid) {
			var _container = _boxid;
			process();
		}
	}
	function process(){
		var _box_li = [];
		var _holder = _container.getElementsByTagName('li');
		_box_li._W = _container.offsetWidth - o.widthShiftParent;
		var _WLi = 0;
		var _WEl = 0;
		for (var j = 0; j < _holder.length; j++) {
			if (_holder[j].parentNode == _container) {
				var _el = _holder[j].getElementsByTagName(o.childTagName);
				for (var k = 0; k < _el.length; k++) {
					if (_el[k].parentNode == _holder[j]) {
						_holder[j]._el = _el[k];
						_holder[j]._elW = _el[k].offsetWidth;
						_WEl = _WEl + _holder[j]._elW;
					}
				}
				_holder[j]._w = _holder[j].offsetWidth;
				_WLi = _WLi + _holder[j]._w;
				_box_li.push(_holder[j]);
			}
		}
		_box_li._WEl = _WEl;
		
		_box_li._WLi = _WLi;
		_setWidth();
		
		function _setWidth(){
			var _countLi = _box_li.length;
			if (o.firtsLast && _countLi > 1) {
				_box_li[0].className += ' ' + o.firstClass;
				_box_li[_countLi - 1].className += ' ' + o.lastClass;
				if (o.childFirtsLast) {
					_box_li[0]._el.className += ' ' + o.firstClass;
					_box_li[_countLi - 1]._el.className += ' ' + o.lastClass;
				}
			}
			var _width = (_box_li._W - _box_li._WLi) / _countLi;
			if (o.liWidth) {
				if (o.mini && _countLi > 1) {
					_width = (_box_li._W - _box_li._WLi) / (_countLi - 1);
					if (o.widthShift == 0) {
						_width = Math.round(_width);
						var _balance = _box_li._W - (_width * (_countLi - 1) + _box_li._WLi);
					}
					else {
						_width = Math.round(_width - o.widthShift);
						var _balance = _box_li._W - ((_width * (_countLi - 1) + _box_li._WLi) + o.widthShift * (_countLi - 1));
					}
					var _miniWidth = Math.round(_width / 2);
					_balance = _balance + (_width - (_miniWidth * 2));
					for (var i = 0; i < _countLi; i++) {
						if (i == (_countLi - 1)) {
							_box_li[i].style.width = _box_li[i]._w + _miniWidth + _balance + 'px';
						}
						else 
							if (i == 0) {
								_box_li[i].style.width = _box_li[i]._w + _miniWidth + 'px';
							}
							else {
								_box_li[i].style.width = _box_li[i]._w + _width + 'px';
							}
					}
				}
				else {
					if (o.widthShift == 0) {
						_width = Math.round(_width);
						var _balance = _box_li._W - (_width * _countLi + _box_li._WLi);
					}
					else {
						_width = Math.round(_width - o.widthShift);
						var _balance = _box_li._W - ((_width * _countLi + _box_li._WLi) + o.widthShift * (_countLi));
					}
					for (var i = 0; i < _countLi; i++) {
						if (i == (_countLi - 1)) {
							_box_li[i].style.width = _box_li[i]._w + _width + _balance + 'px';
						}
						else {
							_box_li[i].style.width = _box_li[i]._w + _width + 'px';
						}
					}
				}
			}
			else {
				var _widthChild = (_box_li._W - _box_li._WEl) / _countLi;
				if (o.mini && _countLi > 1) {
					_widthChild = (_box_li._W - _box_li._WEl) / (_countLi - 1);
					if (o.widthShift == 0) {
						_widthChild = Math.round(_widthChild);
						var _balance = _box_li._W - (_widthChild * (_countLi - 1) + _box_li._WEl);
					}
					else {
						_widthChild = Math.round(_widthChild - o.widthShift);
						var _balance = _box_li._W - ((_widthChild * (_countLi - 1) + _box_li._WEl) + o.widthShift * (_countLi - 1));
					}
					var _miniWidth = Math.round(_widthChild / 2);
					_balance = _balance + (_widthChild - (_miniWidth * 2));
					for (var i = 0; i < _countLi; i++) {
						if (i == (_countLi - 1)) {
							_box_li[i]._el.style.width = _box_li[i]._elW + _miniWidth + _balance + 'px';
						}
						else 
							if (i == 0) {
								_box_li[i]._el.style.width = _box_li[i]._elW + _miniWidth + 'px';
							}
							else {
								_box_li[i]._el.style.width = _box_li[i]._elW + _widthChild + 'px';
							}
					}
				}
				else {
					if (o.widthShift == 0) {
						_widthChild = Math.round(_widthChild);
						var _balance = _box_li._W - (_widthChild * _countLi + _box_li._WEl);
					}
					else {
						_widthChild = Math.round(_widthChild - o.widthShift);
						var _balance = _box_li._W - ((_widthChild * _countLi + _box_li._WEl) + o.widthShift * (_countLi));
					}
					for (var i = 0; i < _countLi; i++) {
						if (i == (_countLi - 1)) {
							_box_li[i]._el.style.width = _box_li[i]._elW + _widthChild + _balance + 'px';
						}
						else {
							_box_li[i]._el.style.width = _box_li[i]._elW + _widthChild + 'px';
						}
					}
				}
			}
		}
	}
}