var xmlHttp = null;
var opacityControl = 100;

function ajaxLoad(page, params, target){
	try{
		xmlHttp=new XMLHttpRequest();
	}catch (e){
		try{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}catch (e){
			try{
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			}catch (e){
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
	
	xmlHttp.onreadystatechange = function(){
		if(xmlHttp.readyState == 4){
			document.getElementById(target).innerHTML = xmlHttp.responseText;
		}else{
			document.getElementById(target).innerHTML = "";
		}
	}
	
	xmlHttp.open("GET",page,true);
	xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xmlHttp.setRequestHeader("Content-length", params.length);
	xmlHttp.setRequestHeader("Connection", "close");
	//xmlHttp.overrideMimeType('text/html');
	xmlHttp.send(params);
}

function loadSignUp(){
	document.getElementById('signup_box').style.display = 'block';
	ajaxLoad("signup.html","","signup_box");
}

function unloadSignUp(){
	document.getElementById('signup_box').style.display = 'none';
}