jQuery.fn.extend({
    disableSelection : function() {
        this.each(function() {
            this.onselectstart = function() { return false; }; // IE, Chrome, Safari
            this.unselectable = "on"; // IE, Opera
            jQuery(this).css('-moz-user-select', 'none'); // FF
        });
    },
    enableSelection : function() {
        this.each(function() {
            this.onselectstart = function() {};
            this.unselectable = "off";
            jQuery(this).css('-moz-user-select', 'auto');
        });
    }
});