gistfile1.js

// proposed 'until' extension to jQuery.dir to support 'nextUntil' and 'prevUntil'
// suggested by LaC_OS_X

jQuery.dir = function( elem, dir, until ){
	var matched = [], cur = elem[dir];
	while ( cur && cur != document ) {
		if ( cur.nodeType == 1 )
			matched.push( cur );
		if ( until && jQuery( cur ).is( until ) )
			return matched;
		cur = cur[dir];
	}
	return matched;
};

jQuery.each({
	nextUntil: function(elem,selector){return jQuery.dir(elem,"nextSibling",selector);},
	prevUntil: function(elem,selector){return jQuery.dir(elem,"previousSibling",selector);}
}, function(name, fn){
	jQuery.fn[ name ] = function( selector ) {
		var ret = jQuery.map( this, function( elem ){ return fn( elem, selector ) } );
		return this.pushStack( jQuery.unique( ret ), name, selector );
	};
});