It is fixed thanks to this post:
Hi, You can overwrite the email field class name if you want to use your own. In the OnLoad event, try: crmForm.all.emailaddress1.className = "ms-crm-Field-Normal"; //then put your code here. Hope it helps.
Cheers, Jim --------------------------------------------------------------------------------
Jim Wang - MVP Dynamics CRM - http://jianwang.blogspot.com , http://mscrm.cn
I changed the class on the OnChange event then checked this
property.