data method

window.jQuery = (window.jQuery  || {});

(function() {
	var uuid = 0;
	var expando = "jQuery" + +new Date; // like "jQuery123456789"
	
	jQuery._cache = {};
	
	jQuery.data = function( elem, name, value ) {
		if (typeof value == "undefined") {
			return jQuery._getData(elem, name);
		}
		else {
			return jQuery._setData(elem, name, value);
		}
	}
	
	jQuery._setData = function( elem, name, value ) {
		if (!elem[expando]) elem[expando] = ++uuid;
		var id = elem[expando];
		
		if (!jQuery._cache[id]) jQuery._cache[id] = {};
		jQuery._cache[id][name] = value;
		
		return id;
	}
	
	jQuery._getData = function( elem, name ) {
		var id = elem[expando];
		
		return jQuery._cache[id][name];
	}
})();