dom.event.addEventListener(window,"load",initDoc);
function initDoc(){
	var imgs = getImgs();
	var tab1 = imgs.item(0);
	var tab2 = imgs.item(1);
	dom.event.addEventListener(tab1,"click",tabFunc);
	dom.event.addEventListener(tab2,"click",tabFunc);
	if(window.opera){
		document.getElementById("mainContents").style.top = "-1px";
	}
}


//NEW_BLOCK
//NP_BLOCK

function tabFunc(evt){
	
	var target = dom.event.target(evt);
	
	var new_block = document.getElementById("new_block");
	var blog_block = document.getElementById('blog_block');
	
	var imgs = getImgs();
	
	
	if(target.parentNode.id == "tab1"){
		new_block.style.display = "block";
		blog_block.style.display = "none";
		
		imgs.item(0).src = "/images/newTtlOn.jpg";
		imgs.item(1).src = "/images/paperTtl.jpg";
	
	}else{
		new_block.style.display = "none";
		blog_block.style.display = "block";
		target.src = "";
		imgs.item(0).src = "/images/newTtl.jpg";
		imgs.item(1).src = "/images/paperTtlOn.jpg";
	
	}

}


function getImgs(){
	var tabNavis = document.getElementById("tabNavis");
	var imgs = tabNavis.getElementsByTagName("IMG");
	return imgs;
}