Let's say on ajax success the function: xmlParser(xml) is called and the XML response contains about 1500 xml elements (for example: ...)

Inside it looks like:

function xmlParser(xml){
    var xmlDOM = $(xml);  // dom object containing xml response

    xdom.find("book").each(function(){
        var $node = $(this);
        // parsing all the <book> nodes
    });
}

How can you say: parse only first 20 nodes from the xml response, do something with them. And you have a button,..when clicked parses the next 20 nodes...and so on.

So bassically, is there something like: children(20)....and a function wich will parse the next 20 nodes onClick.

thx