Hi,
I am using the following code to create checkbox options:

<tr>
<td class='ftbl_row_1' ><LABEL ACCESSKEY=''><input type='checkbox' name='SymposiumTheme' id='SymposiumTheme[0]' value='LG'>College Land-Grant System</LABEL>&nbsp;
</td></tr>
<tr>
<td class='ftbl_row_2' ><LABEL ACCESSKEY=''><input type='checkbox' name='SymposiumTheme' id='SymposiumTheme[1]' value='GreenChem'>Green/Sustainable Chemistry</LABEL>&nbsp;
</td></tr>

I have only shown two of the seven checkbox choices (all others have similar format).

The problem is that a user can click all checkboxes before submitting the form the above code is embedded within.

I want to limit the user to one checkbox (of their choosing but allow them to correct an inadvertant incorrect selection).

It is my understanding that -by default- html code only allows one box to be selected...where am I going wrong?

Thank you.

Nope, not so. You don't want checkboxes. You want radio buttons.
http://htmlhelp.com/reference/html40/forms/input.html