/* タブ切り替え */
var tab = {
    init: function(){
        var tabs = this.setup.tabs;
        var pages = this.setup.pages;

        for(i=0; i<pages.length; i++) {
            if(i !== 0) pages[i].style.display = 'none';
            tabs[i].onclick = function(){ tab.showpage(this); return false; };
        }
    },

    showpage: function(obj){
        var tabs = this.setup.tabs;
        var pages = this.setup.pages;
        var num;

        for(num=0; num<tabs.length; num++) {
            if(tabs[num] === obj) break;
        }

        for(var i=0; i<pages.length; i++) {
            if(i == num) {
                pages[num].style.display = 'block';
                tabs[num].className = 'present';
            }
            else{
                pages[i].style.display = 'none';
                tabs[i].className = null;
            }
        }
    }
}