function doMoveTab(itab){
	document.getElementById("areatab").style.display=(itab==1 ? "block":"none");
	document.getElementById("ensentab").style.display=(itab==2 ? "block":"none");

	document.getElementById("link1").src="/image/index/area"+(itab==1 ? "_on":"_off")+".gif";
	document.getElementById("link2").src="/image/index/ensen"+(itab==2 ? "_on":"_off")+".gif";

	document.getElementById("a"+itab).removeAttribute("href");

	for(i=1;i<=2;i++){
		if(i!=itab)document.getElementById("a"+i).href="javascript:doMoveTab("+i+");";
	}
}