It would work but isn't very pretty. Some HTML/javascript as follows might be better.

(This is untested, so there may be bugs, but it's hacked from code I've developed before, so shouldn't be far wrong. See the javascript DOM.).

<tr  id="ctl1" name="ctl1" title="Click to toggle the selection of thi
+s row">
    <td>
        <input type="checkbox" onClick="rowSelected('ctl1')">
    </td>
    <span>
        <td>Alfreds Futterkiste</td>
        <td>Berlin</td>
        <td>Germany</td>
    </span>
</tr>
<tr  id="ctl2" name="ctl2" title="Click to toggle the selection of thi
+s row">
    <td>
        <input type="checkbox" onClick="rowSelected('ctl2')">
    </td>
    <span>
        <td>etc. etc. etc.</td>
    </span>
</tr>
<!-- etc. etc. etc -->

<input type='hidden' value='' name='dataToSend'>

function rowSelected(id) {
    if (document.getElementById(id)) {
        var data="";
        var dataArray=document.getElementById(id).getElementsByTagName
+("span")[0].getElementsByTagName("td");
        for (var i=0; i<dataArray.length; i++) {
            data=data+dataArray[i].innerHTML;
        }
        //overwrites previously selected checkbox so may want to conca
+tenate
        document.getElementById('dataToSend').innerHTML=data;
    }
}
[download]