How do i click the link matching a varible?

[PHaRTnONu]

im trying to click the right link here... how would i chose the link with the unique id of 021210
this would be in a varible to be searched or matched for.... how do i do this?

??
thank you

<table class="MessageDataGrid" rules="all" id="ctl00_mainContentPlaceHolder_inboxGridView" style="width:100%;border-collapse:collapse;" border="1" cellspacing="0">
   <tbody><tr class="MessageDataGrid Header">
     <th scope="col" align="center">
       <span title="Select All"><input id="ctl00_mainContentPlaceHolder_inboxGridView_ctl01_chkBxHeader" name="ctl00$mainContentPlaceHolder$inboxGridView$ctl01$chkBxHeader" onclick="javascript:HeaderClick(this);" type="checkbox"></span>
     </th><th scope="col"><a href="javascript:__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView','Sort$SentFrom')">From</a></th><th scope="col"><a href="javascript:__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView','Sort$Subject')">Subject</a></th><th scope="col"><a href="javascript:__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView','Sort$SentDate')">Sent Date</a></th><th scope="col">&nbsp;</th>
   </tr><tr class="MessageDataGrid Item" onmouseover="this.className='MessageDataGrid ItemHighlighted'" onmouseout="this.className='MessageDataGrid Item'" command="REPLY" messageid="1433284451" onclick="__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView','rc0')">
     <td class="MessageDataGrid Item" style="width:23px;" align="center">
       <span command="NormalMessage" messageid="1433284451"><input id="ctl00_mainContentPlaceHolder_inboxGridView_ctl02_chkBxSelect" name="ctl00$mainContentPlaceHolder$inboxGridView$ctl02$chkBxSelect" onclick="javascript:ChildClick(this,'ctl00_mainContentPlaceHolder_inboxGridView_ctl01_chkBxHeader');event.cancelBubble=true;" type="checkbox"></span>
     </td><th class="MessageDataGrid BoldItem" scope="row" style="width:250px;"><a href="#" class="tooltip">FROMNAME 00100  <span>FROMNAME 00100</span></a></th><td class="MessageDataGrid BoldItem"><a href="#" class="tooltip">What's up  <span>What'<br>s up</span></a></td><td class="MessageDataGrid BoldItem">11/18/2016 2:06:18 PM</td><td class="MessageDataGrid BoldItem">
       <a id="ctl00_mainContentPlaceHolder_inboxGridView_ctl02_readLink" href="javascript: if (DES_BtnClick('ctl00_mainContentPlaceHolder_inboxGridView_ctl02_readLink')){try{__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView$ctl02$readLink','')}catch(e){if (window.DES_DSBody)DES_DSBody(false);}}">Read</a>
     </td>
   </tr><tr class="MessageDataGrid Item" onmouseover="this.className='MessageDataGrid ItemHighlighted'" onmouseout="this.className='MessageDataGrid Item'" command="REPLY" messageid="1433283076" onclick="__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView','rc1')">
     <td class="MessageDataGrid Item" style="width:23px;" align="center">
       <span command="NormalMessage" messageid="1433283076"><input id="ctl00_mainContentPlaceHolder_inboxGridView_ctl03_chkBxSelect" name="ctl00$mainContentPlaceHolder$inboxGridView$ctl03$chkBxSelect" onclick="javascript:ChildClick(this,'ctl00_mainContentPlaceHolder_inboxGridView_ctl01_chkBxHeader');event.cancelBubble=true;" type="checkbox"></span>
     </td><th class="MessageDataGrid BoldItem" scope="row" style="width:250px;"><a href="#" class="tooltip">FROMNAME 02120  <span>FROMNAME 02120</span></a></th><td class="MessageDataGrid BoldItem"><a href="#" class="tooltip">RE: need messages  <span>RE: need messages</span></a></td><td class="MessageDataGrid BoldItem">11/18/2016 2:05:27 PM</td><td class="MessageDataGrid BoldItem">
       <a id="ctl00_mainContentPlaceHolder_inboxGridView_ctl03_readLink" href="javascript: if (DES_BtnClick('ctl00_mainContentPlaceHolder_inboxGridView_ctl03_readLink')){try{__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView$ctl03$readLink','')}catch(e){if (window.DES_DSBody)DES_DSBody(false);}}">Read</a>
     </td>
   </tr><tr class="MessageDataGrid Item" onmouseover="this.className='MessageDataGrid ItemHighlighted'" onmouseout="this.className='MessageDataGrid Item'" command="REPLY" messageid="1433047749" onclick="__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView','rc2')">
     <td class="MessageDataGrid Item" style="width:23px;" align="center">
       <span command="NormalMessage" messageid="1433047749"><input id="ctl00_mainContentPlaceHolder_inboxGridView_ctl04_chkBxSelect" name="ctl00$mainContentPlaceHolder$inboxGridView$ctl04$chkBxSelect" onclick="javascript:ChildClick(this,'ctl00_mainContentPlaceHolder_inboxGridView_ctl01_chkBxHeader');event.cancelBubble=true;" type="checkbox"></span>
     </td><th class="MessageDataGrid BoldItem" scope="row" style="width:250px;"><a href="#" class="tooltip">FROMNAME 32123  <span>FROMNAME 32123</span></a></th><td class="MessageDataGrid BoldItem"><a href="#" class="tooltip">RE: RE: name  -  today 8:34pm  <span>RE: RE: name  -  today 8:34pm</span></a></td><td class="MessageDataGrid BoldItem">11/18/2016 9:20:39 AM</td><td class="MessageDataGrid BoldItem">
       <a id="ctl00_mainContentPlaceHolder_inboxGridView_ctl04_readLink" href="javascript: if (DES_BtnClick('ctl00_mainContentPlaceHolder_inboxGridView_ctl04_readLink')){try{__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView$ctl04$readLink','')}catch(e){if (window.DES_DSBody)DES_DSBody(false);}}">Read</a>
     </td>
   </tr>
</tbody></table>

the one i need to click is:

    <td class="MessageDataGrid Item" style="width:23px;" align="center">
       <span command="NormalMessage" messageid="1433283076"><input id="ctl00_mainContentPlaceHolder_inboxGridView_ctl03_chkBxSelect" name="ctl00$mainContentPlaceHolder$inboxGridView$ctl03$chkBxSelect" onclick="javascript:ChildClick(this,'ctl00_mainContentPlaceHolder_inboxGridView_ctl01_chkBxHeader');event.cancelBubble=true;" type="checkbox"></span>
     </td><th class="MessageDataGrid BoldItem" scope="row" style="width:250px;"><a href="#" class="tooltip">FROMNAME 02120  <span>FROMNAME 02120</span></a></th><td class="MessageDataGrid BoldItem"><a href="#" class="tooltip">RE: need messages  <span>RE: need messages</span></a></td><td class="MessageDataGrid BoldItem">11/18/2016 2:05:27 PM</td><td class="MessageDataGrid BoldItem">
       <a id="ctl00_mainContentPlaceHolder_inboxGridView_ctl03_readLink" href="javascript: if (DES_BtnClick('ctl00_mainContentPlaceHolder_inboxGridView_ctl03_readLink')){try{__doPostBack('ctl00$mainContentPlaceHolder$inboxGridView$ctl03$readLink','')}catch(e){if (window.DES_DSBody)DES_DSBody(false);}}">Read</a>
     </td>