gistfile1.js

var elem = document.createElement("div"),
	style = elem.style,
	userSelectProp = "userSelect" in style && "userSelect";

if (!userSelectProp) {
	$.each("Moz Webkit Khtml O".split(" "), function(i, v) {
		var vendorProp = v + "UserSelect";
		if ( vendorProp in style ) {
			userSelectProp = vendorProp;
			return false;
		}
	});
}
var selectStart = !userSelectProp && "onselectstart" in elem && "selectstart.mouse";

elem = null;

$.fn.extend({
	disableSelection: function() {
		if (unselectableProp) {
			this.css(userSelectProp, "none");
		} else {
			this.find( "*" ).andSelf().attr( "unselectable", "on" );
		}
		
		if (selectStart) {
			this.bind(selectStart, function() {
				return false;
			});
		}
		
		return this;
	},
	enableSelection: function() {
		if (unselectableProp) {
			this.css(userSelectProp, "");
		} else {
			this.find( "*" ).andSelf().attr( "unselectable", "off" );
		}
		
		if (selectStart) {
			this.unbind(selectStart);
		}
		
		return this;
	}
});