Hi,
Please modify your code as per following:
<a href="javascript:toggleDiv('mydiv' + <%# Eval(" coursecatid=")%>)">[+]</a>
<div id="mydiv<%# Eval("CourseCatID")%>" style="display:none">
</div>
Note: this would only work if
CourseCatID has
Unique value.
Thanks,
Imndadhusen