function dhqh(a,b,c)
{
eval("document.getElementById('bg"+a+"').className='cr2'");
eval("document.getElementById('bg"+b+"').className='cr1'");
eval("document.getElementById('bg"+c+"').className='cr1'");

eval("document.getElementById('qh"+a+"').style.display='block'");
eval("document.getElementById('qh"+b+"').style.display='none'");
eval("document.getElementById('qh"+c+"').style.display='none'");

}