I have an ASP.NET application that renders multiple questions with the option to provide an explanation for the answers given.

<label for=[<%:count %>].AnswerExplanation_<%: i+1 %> id=[<%:count %>].toggleExplanation_<%: i+1 %>><strong>Add Explanation</strong></label>

<br /><br />

<div id=[<%:count %>].Explanation_<%: i+1 %>>

    <textarea id=[<%:count %>].AnswerExplanation_<%: i+1 %> name=[<%:count %>].AnswerExplanation_<%: i+1 %> class=ckedit></textarea>

</div>

so you will have id's like [X].toggleExplanation_Y corresponding to [X].AnswerExplanation_Y

I am writing a javascript function to show/hide the AnswerExplanation divs, and was looking for a way to select every id containing toggleExplanation I should be able to get the rest from there.