JQuery :: Validating Dynamically Generated Fields

I'm trying to validate a set of dynamically created field names, for example

Name: <input type='text' name="s1[name]" id="s1[name]">
Image: <input type='text' name="s1[image]" id="s1[image]">
Name: <input type='text' name="s2[name]" id="s2[name]">
Image: <input type='text' name="s2[image]" id="s2[image]">

[Code].....

There can be any number of 'groups' but I would want to apply some validation for each item in a group. I can only see that the validation is done by specifying a id? however as the id's are going to be dynamically created how can I do this? can you validate for a css class?