function msgselect(chkid)

{

 selchk = document.getElementById(chkid);
 if(selchk.value != true)

               selchk.checked = true;
                  
        else
                   
              
 selchk.checked = false;
}

// those are the tr that when i click on them they check the checkbox...for some reaosn the first one chksl1 doesnt works and when i check let say 2 or 3 when i click on the tr again it wont unclick...

 <tr 
class="off" onmouseover="this.className='on'" onmouseout="this.className='off'" onclick="msgselect('chksl1')">
                <td align="center">1</td>
                <td align="center"><div id="cBoxes">
<input name="chksl1" type="checkbox" id="chksl1" value="1" /></div></td>
                <td>SUBJECT TESTINGGSDF</td>
                <td>2007-03-24 12:12:25</td>
                <td>1</td>
                <td>ezek2k4</td>
              </tr>
              <tr 
class="off" onmouseover="this.className='on'" onmouseout="this.className='off'" onclick="msgselect('chksl2')">
                <td align="center">2</td>
                <td align="center"><div id="cBoxes">
<input name="chksl2" type="checkbox" id="chksl2" value="2" /></div></td>
                <td>Subject$2</td>
                <td>2007-03-24 01:01:01</td>
                <td>2</td>
                <td>ezek2k4</td>
              </tr>
              <tr 
class="off" onmouseover="this.className='on'" onmouseout="this.className='off'" onclick="msgselect('chksl3')">
                <td align="center">3</td>
                <td align="center"><div id="cBoxes">
<input name="chksl3" type="checkbox" id="chksl3" value="3" /></div></td>
                <td>Subject testing #4</td>
                <td>2007-04-04 00:00:00</td>
                <td>3</td>
                <td>ezek</td>
              </tr>
              <tr 
class="off" onmouseover="this.className='on'" onmouseout="this.className='off'" onclick="msgselect('chksl4')">
                <td align="center">4</td>
                <td align="center"><div id="cBoxes">
<input name="chksl4" type="checkbox" id="chksl4" value="4" /></div></td>
                <td>SUBJECT TESTING AGAIN</td>
                <td>2007-04-10 00:00:00</td>
                <td>4</td>
                <td>me :)</td>
              </tr>