var myServer = "/ajax/dyndestsearch";
var mySchema = ["\n", "\t"];
var myDataSource = new YAHOO.widget.DS_XHR(myServer, mySchema);
myDataSource.responseType = YAHOO.widget.DS_XHR.TYPE_FLAT;
//myDataSource.scriptQueryAppend = "form=SUCH&field=lala"; 
myDataSource.maxCacheEntries = 1024; 
myDataSource.queryMatchSubset = false;