function toggle(div)
{
var option=['busan','marketres','campdev', 'opt', 'path'];

for(var i=0; i<option.length; i++)
{ obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div) && !(obj.style.display=="block")? "block" : "none"; }
}

window.onload=function(){switch1('busan');}