function getElementsByClassName(searchClass){
	var classElements=new Array();
	var allElements=document.getElementsByTagName("*");
	for(i=0,len=allElements.length; i<len; i++){
		if(allElements[i].className==searchClass){
			classElements.push(allElements[i]);
		}
	}
	return classElements;
}
function changeTabs(){
	var titlenews=document.getElementById("newswaku");
	var titleinfo=document.getElementById("infowaku");
	var titlepres=document.getElementById("preswaku");
	var titleevent=document.getElementById("eventwaku");
	
	if(!titlenews) return false;
	
	var tabnews=getElementsByClassName("tabnews");
	var tabinfo=getElementsByClassName("tabinfo");
	var tabpres=getElementsByClassName("tabpres");
	var tabevent=getElementsByClassName("tabevent");
	
	for(var i=0,len=tabnews.length; i<len; i++){
		tabnews[i].onclick=function(){
			titlenews.style.display="block"
			titleinfo.style.display="none"
			titlepres.style.display="none"
			titleevent.style.display="none"
			return false;
		}
		tabinfo[i].onclick=function(){
			titlenews.style.display="none"
			titleinfo.style.display="block"
			titlepres.style.display="none"
			titleevent.style.display="none"
			return false;
		}
		tabpres[i].onclick=function(){
			titlenews.style.display="none"
			titleinfo.style.display="none"
			titlepres.style.display="block"
			titleevent.style.display="none"
			return false;
		}
		tabevent[i].onclick=function(){
			titlenews.style.display="none"
			titleinfo.style.display="none"
			titlepres.style.display="none"
			titleevent.style.display="block"
			return false;
		}
	}
	return true;
}
window.onload=function(){
	changeTabs();
}