<code lang="Generic">$(function () {
	var 
		name=null,
		value=null,
		current=null,
		orig=null;
	$('input[type="checkbox"], input[type="radio"]')
		.mousedown(function () {
			if (!this.hasAttribute('name')) return;
			orig = this;
			name = this.getAttribute('name');
			var radio = this.getAttribute('type').toLowerCase() == 'radio';		
			if (radio)
				value = true;
			else			
				value = !this.checked;
			this.checked = value;
		})
		.hover(function () {
			if (name===null) return;
			if (this.getAttribute('name')!==name) return;
			if (current!==this) {		
				current = this;
				this.checked = value;
				$(this).change();
				this.focus();
			}
		}, function () {
			if (name===null) return;			
			current = null;
		}).change(console.log);
	$().mouseup(function (e) {
		if (name===null) return;		
		name = null;

		if (e.originalTarget===orig) {
			var radio = orig.getAttribute('type').toLowerCase() == 'radio';
			if (radio)
				orig.checked = true;
			else
				orig.checked = !value;
		}
	});
});</code>