jQuery.fn.swap = function(b){ 
			b = jQuery(b)[0]; 
			var a = this[0]; 
			var t = a.parentNode.insertBefore(document.createTextNode(''), a); 
			b.parentNode.insertBefore(a, b); 
			t.parentNode.insertBefore(b, t); 
			t.parentNode.removeChild(t); 
			return this; 
};