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<div id="line2" >
<div class="child" id="sub1" ></div>
<div class="child" id="sub2" ></div>
<div class="child" id="sub3" ></div>
...
</div>
function showSub(i){
var oo=document.getElementById('line2').childNodes;
for(i=0;i<oo.length;i++){
if(oo[i].className=='child')oo[i].className='hideIt';
if(oo[i].className=='showIt')oo[i].className='hideIt';
}
document.getElementById('sub'+i).className='showIt';
}