Attributes aren't written out for each Item.

Can't you add  the onClick to the CBL it-self and loop thru the elements in JS ??

CheckBoxList1.Attributes["onClick"] = "return checkPIME(this);";

-or-

You could make a control(inherit from CBL) and write out the attributes  for each element I guess.

I did that for a ListBox to show the color attrib.

Sample: www.gotdotnet.com/.../keywordsrch.aspx%20with%20color%20attribute