function content_swap(num,dir){
//alert(num);
for(i=1; i<4; i++)
{
	if(i==num) {
		document.getElementById("Tab"+i).src=dir+"/images/notice_t" + i + "_over.gif";
		document.getElementById("tb"+i).style.display="";
	}else{
		document.getElementById("Tab"+i).src=dir+"/images/notice_t" + i + ".gif";
		document.getElementById("tb"+i).style.display="none";
		}
	}
}