var gtab = {
	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(){ gtab.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;
			}
		}
	}
}