(function () {
	//Minimalist cross-browser support
	if (window.addEventListener) {
		function observe(o,e,f) {
			return o.addEventListener(e,function (e) {
				return f.apply(e.target, [e]); 
			},false);
		}
		function triggerChange(o) {
			var evt = document.createEvent('HTMLEvents');
			evt.initEvent('change',false,true);
			o.dispatchEvent(evt);
		}
		function attr(o,n) { return o.getAttribute(n); }
	} else if (window.attachEvent) {
		function observe(o,e,f) {
			return o.attachEvent('on'+e,function () { 
				var e = window.event;
				e.originalTarget = e.srcElement; 
				return f.apply(e.target, [e]); 
			});
		}
		function triggerChange(o) {
			o.fireEvent('onchange');
		}
	} else {
		return;
	}
	
	//Actual program starts here
	var 
		name=null,
		value=null,
		current=null,
		orig=null,
		to=null;	
	function md(e) {
		to = setTimeout(function () {
			mh(e);
		}, 50);
		if (e.originalTarget.name=='') return;
		orig = e.originalTarget;
		name = orig.name;
		var radio = orig.type.toLowerCase() == 'radio';		
		if (radio)
			value = true;
		else			
			value = !this.checked;
		this.checked = value;		
	}
	function mh(e) {
		if (name===null) return;
		to=null;
		var _$ = e.originalTarget;
		if (_$.name!==name) return;
		if (current!==this) {		
			current = this;
			_$.checked = value;
			triggerChange(_$);
			_$.focus();
		}		
	}
	function ml() {
		if (name===null) return;			
			current = null;
	}
	function up(e) {
		if (to!==null) {
			clearTimeout(to);
			to=null;
		}
		if (name===null) return;		
		name = null;
		if (e.originalTarget===orig) {
			var radio = orig.type.toLowerCase() == 'radio';
			if (radio)
				orig.checked = true;
			else
				orig.checked = !value;
		}
		name=null;
		value=null;
		current=null;
		orig=null;
		to=null;	
		
	}
	observe(window,'load',function () {
		observe(document.body, 'mouseup', up);
		var checks = document.body.getElementsByTagName('input');
		for (var i=0; i