function mk_array(){
	var leng = mk_array.arguments.length;
	for(i = 0; i < leng; i++){
		this[i] = mk_array.arguments[i];
	}
}

function Jump_anchor(){
	var url_slct;
	var url_list = new mk_array('',
	'about/index.html',	//1番目
	'activities/index.html',	//2番目
	'publication/index.html',	//3番目
	'news/index.html',	//4番目
	'contact/index.html'	//5番目
	);
	url_slct = document.Jump.list_title.selectedIndex;
	if(url_list[url_slct] != ''){
		location = url_list[url_slct];
	}
}