function secBoard(m,n) 
{ 
    for(i=1;i<3;i++) 
    { 
        eval("document.getElementById('cl_"+m+""+i+"').className='Label1'"); 
        eval("document.getElementById('tbx_"+m+""+i+"').style.display='none'"); 
    } 
    eval("document.getElementById('cl_"+m+""+n+"').className='Label2'"); 
    eval("document.getElementById('tbx_"+m+""+n+"').style.display='block'"); 
}
function secBoard4(m,n) 
{ 
    for(i=1;i<5;i++) 
    { 
        eval("document.getElementById('cl_"+m+""+i+"').className=''"); 
        eval("document.getElementById('tbx_"+m+""+i+"').style.display='none'"); 
    } 
    eval("document.getElementById('cl_"+m+""+n+"').className='on'"); 
    eval("document.getElementById('tbx_"+m+""+n+"').style.display='block'"); 
}