<div id="form">

<select name="AAA"><option value="111" selected>111<option value="222">222</select>

<select name="BBB"><option value="111" >111<option value="222" selected>222</select>

<input type="text" name="XXX" value="foo"/>

<input type="text" name="YYY" value="bar" />

<input type="text" name="ZZZ" value="baz" />

<input type="checkbox" name="DDD" value="baz" checked/>

<select name="CCC"><option value="111" >111<option value="222">222<option value="333" selected>333</select>

</div>

<table>

<tr><th>expect</th><th>result</th></tr>

<tr><td><textarea id="expect" style="width: 100px; height: 100px"></textarea></td><td><textarea id="resultset" style="width: 100px; height: 100px"></textarea></td></tr>

<tr><td colspan="2"><input type="text" id="eq" style="width: 200px"></td></tr>

</table>

<script src="http://code.jquery.com/jquery-1.5.2.js"></script>

<script>

(function($) {

var $resultset = [], $expect = "AAA=111\\r\\nBBB=222\\r\\nXXX=foo\\r\\nYYY=bar\\r\\nZZZ=baz\\r\\nCCC=333";

$('#form').find('select,:text').each(function(){

$resultset.push (this.name + '=' + this.value);

});

var $result = $resultset.join("\\r\\n");

$('#resultset').val($result);

$('#expect').val($expect);

$('#eq').val($result == $expect ? 'equal' : 'not equal');

})(jQuery);

</script>

<!-- in Opera 11 we have only "select" without :text -->