var draggable;

// disable IE specialities
document.ondragstart = function () { return false; };

// bound dragging into document
var doc = $(document).bind("mousedown mouseup", function(e) {

	var el = $(e.target);

	if (e.type == "mousedown" && el.data("drag")) {
		var y = el.offset().top - e.pageY;

		doc.bind("mousemove", function(evt) {
			if (!draggable) {
				draggable = el.css({position: 'absolute'});
				el.trigger("dragstart");
			}
			el.css({ top: evt.pageY + y }).trigger("drag");
		});

		e.preventDefault();

	// mouseup
	} else if (draggable) {
		draggable.css({ position: 'static'}).trigger("dragend");
		doc.unbind("mousemove");
		draggable = 0;
	}

});

$.fn.mootdrag = function() {
	return this.data("drag", true);
};