function expand(sec)
{


if (sec != null){
if (sec > 0){
if (document.getElementById('e'+sec).style.display != 'none'){
document.getElementById("detail_expand").style.display="inline";
for (var i=0;i<=sec;i++) {document.getElementById('e'+i).style.display = 'none';}
document.getElementById("detail_collapse").style.display="none";
}
else{
document.getElementById("detail_collapse").style.display="inline";
document.getElementById("detail_expand").style.display="none";
for (var i=0;i<=sec;i++) {document.getElementById('e'+i).style.display = 'inline';}
}
}
else{
if (document.getElementById('e0').style.display != 'none')     {
document.getElementById("detail_collapse").style.display="none";
document.getElementById("detail_expand").style.display="inline";
document.getElementById('e0').style.display = 'none';
}
else{
document.getElementById("detail_collapse").style.display="inline";
document.getElementById("detail_expand").style.display="none";
document.getElementById('e0').style.display = 'inline';
}
}
}

}