function showTab(show){
	for (var i = 1; i < 17; i++) {		
		if (i != show) {
			$('content_'+i).style.display='none';
			$('nav_'+i).className = $('nav_'+i).className.replace('active','');
		} else {
			$('content_'+show).style.display='';
			$('nav_'+show).className='active';
		}
	}
	
} 

function createRequestObject() {
var ro;
var browser = navigator.appName;
	if(browser == "Microsoft Internet Explorer") {
		try {
			ro = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				ro = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	} else {
		// on every other browser, we can directly create a new XMLHttpRequest object
		ro = new XMLHttpRequest();
	}
	return ro;
}

var http = createRequestObject();

function handleResponse() {
	if(http.readyState == 4) {
		var response = http.responseText;
    	var update = new Array();

		if(response.indexOf('+' != -1)) {
    		update = response.split("+");
			for (i = 0; i <= (update.length - 1); i++)
			{
				x = i + 1;
				document.getElementById(update[i]).innerHTML = update[x];
				i++;
			}
		}
	}
}


// this function should be called for user input
// it opens up the usercheck.asp page with a querystring of 'action'
function addMeToCart(id)
{
	var id;
	document.getElementById("rec-" + id).innerHTML = "Added to Cart";
	http.open("get", "/addme.asp?id=" + id);
  	http.onreadystatechange = handleResponse;
  	http.send(null);
}