Hi, I'm having a small problem with setting the value of a hidden form field in the customUserCreateForm extension. The alert gives the correct value, but somehow it doesn't get posted after the user created a new account. The value of the hidden value has to be set when someone checks a checkbox. <input type='checkbox' name="wpFacultyCheck" onChange="createUserToggle(this)" id="wpFacultyChecker" /> <input type="hidden" id="hiddenFacultyField" name="hiddenFacultyField" value="" /> Then in common.js I have: function createUserToggle(obj){ if(obj.checked){ document.userlogin2.hiddenFacultyField.value="yes"; }else{ document.userlogin2.hiddenFacultyField.value="no"; } alert(obj.value +" "+ document.getElementById('hiddenFacultyField').value) } addOnloadHook(createUserToggle); I used "onchange" as "onclick" doesn't work in FF3. Does anyone have a good solution for this? Thanks, Alain