in rico.js [260:267]
_getDirectChildrenByTag: function(e, tagName) {
var kids = new Array();
var allKids = e.childNodes;
for( var i = 0 ; i < allKids.length ; i++ )
if ( allKids[i] && allKids[i].tagName && allKids[i].tagName == tagName )
kids.push(allKids[i]);
return kids;
}