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;
var retStr;

	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';
	var images = tabs[num].getElementsByTagName("img");
	images[0].src = images[0].src.replace("_off.", "_on.");
	}
	else{
	pages[i].style.display = 'none';
	var images = tabs[i].getElementsByTagName("img");
	images[0].src = images[0].src.replace("_on.", "_off.");
	}
	}	
}
}