var boxes = document.getElementsByTagName('input'); 
 	for(var index = 0; index < boxes.length; index++) 

I have a form with some controls inside it.. when I load the page and see the source code, the form is correctly there, but, by using firebug, this is shown: ----BEFORE---- Eliminar /* <![CDATA[ */ function checkAll() { var boxes = document.getElementsByTagName('input'); for(var index = 0; index < boxes.length; index++) { box = boxes[index]; if (box.type == 'checkbox' && box.className == 'sf_admin_batch_checkbox') box.checked = document.getElementById('sf_admin_list_batch_checkbox').checked } return true; } /* ]]> */ ----AFTER---- As you see, the form tag appears empty. The correct is that inside form tag is the UL, the TABLE and the HIDDEN fields. Any help will be appreciated, thanks Jaime == This happened == Every time Firefox opened == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)