Hi,
adding JS + AJAX CRM 3,4 using Internet explorer 6 may cause edit.aspx to freeze when loading.
Reason:
When page is loading explorer 6 behavior is a different from explorer 7,8.
If you add some code ( JS + ajax) when page is loading .. before client finish with all methods the lookup fields on the screen start to throw error (on focus event). but in explorer 7 only after all code is finished then lookup start with focus.
You can change the htc, JS files in many places but this is not a good solution.
solution:
upgrading to Internet explorer 7,8 solve this issue.
thanks Rami,