//JavaScript Document
function setTab(num){
 onClickTab(num);
}

function onClickTab(num){
for(var i=1; i<=4; i++){
var obj=document.getElementById("tab"+i);
var obj2=document.getElementById("tabArea"+i);
if(num==i)
{
obj2.style.display="block";
}
else
{
obj2.style.display="none";
}
}
}