Today I learned that there is more than one way to implement Ajax, namely:

• using a hidden frame
• using a hidden iFrame
• calling ActiveXObject() for IE6 or earlier
• calling XMLHttpRequest() for all other browsers
• using a third party library like zXML or DWR
• creating dynamic images by using new Image() on the fly
• dynamic script loading by using document.createElement("script")

The book I am reading is called Professional Ajax.