function ajaxFunction(){
	var ajaxRequest;
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				//browsers all not support, rare case
				alert("Your browser broke!");
				return false;
			}
		}
	
	}
	return ajaxRequest;
}

function login(){

	htmlRequestLogin = ajaxFunction();
	
	if (htmlRequestLogin==null){ // If it cannot create a new Xmlhttp object.
		alert ("Browser does not support HTTP Request");
		return false;
	} 
	
	if (document.loginform.username.value == "" || document.loginform.password.value == ""){
		document.getElementById("loginerror").innerHTML = "<p class=\"error\">Missing Field(s)</p>";
		return false;
	}else{
		document.getElementById("loginerror").innerHTML = "";
	}
	
	htmlRequestLogin.onreadystatechange = function(){
		
		if(htmlRequestLogin.readyState == 4){

			if (htmlRequestLogin.responseText == "no"){
				document.getElementById("loginerror").innerHTML = "<p class=\"error\">Login Failed</p>";
			}else{
				document.getElementById("loginBox").innerHTML = htmlRequestLogin.responseText;
			}
			
		}
		
	}
	
	htmlRequestLogin.open("POST", "/scripts/login.php", true);
	htmlRequestLogin.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	htmlRequestLogin.send("username="+document.loginform.username.value+"&&password="+document.loginform.password.value);
	
}