function asecBoard(n) 
{ 
    for(i=1;i<6;i++) 
    { 
        eval("document.getElementById('al0"+i+"').className='a102'"); 
        eval("abx0"+i+".style.display='none'"); 
    } 
    eval("document.getElementById('al0"+n+"').className='a101'"); 
    eval("abx0"+n+".style.display='block'"); 
}