Hi Cocoaholic,
Auto Collapse Empty Custom Fields extension if used together with Required Category extension causes a javascript error.
To replicate this error you these steps are needed:
1) install Required category extension
2) set categories to be required for one particular weblog
3) try to post an entry to that weblog without assigning to a category.
Firebug shows this error
el_name has no properties
if (el_name.substring(0,8)=='field_id') {
It is the line from the script which Auto Collapse Empty Custom Fields extension injects:
//<![CDATA[
form_elements = document.getElementById('entryform').elements;
var id_arr = new Array();
for(i=0; i<form_elements.length; i++) {
el = form_elements[i];
el_name = el.name;
toggle = 0;
if (el_name.substring(0,8)=='field_id') {
