function checkUsername(input, span_obj)
{
	input.value = input.value.replace(" ", "_");
	ajaxCheckRegValues("username", input, span_obj);
}

function checkPassword(input, span_obj)
{
	if (input.value.length < 6)
	{
		span_obj.innerHTML = "<img src='/images/reg_nocheck.png' /> Too short";
	}else{
		span_obj.innerHTML = "<img src='/images/reg_check.png' />";
	}
}

function checkPassword2(password1, password2, span_obj)
{
	if (password2.value != "")
	{
		if (password2.value == password1.value)
		{
			span_obj.innerHTML = "<img src='/images/reg_check.png' />";
		}else{
			span_obj.innerHTML = "<img src='/images/reg_nocheck.png' /> Passwords don't match";
		}
	}
}

function checkEmail(input, span_obj)
{
	ajaxCheckRegValues("email", input, span_obj);	
}

function checkFullname(input, span_obj)
{
	if (input.value.length < 5)
	{
		span_obj.innerHTML = "<img src='/images/reg_nocheck.png' /> Must be at least 5 characters";
	}else{
		span_obj.innerHTML = "<img src='/images/reg_check.png' />";
	}
}

function checkSecurityQA(input, span_obj)
{
	if (input.value.length < 3)
	{
		span_obj.innerHTML = "<img src='/images/reg_nocheck.png' /> Must be at least 3 characters";
	}else{
		span_obj.innerHTML = "<img src='/images/reg_check.png' />";
	}
}

//Browser Support Code
function ajaxCheckRegValues(check_type, input_obj, span_obj)
{
	var ajaxRequest;  // The variable that makes Ajax possible!
	var obj_val = input_obj.value;
	var currentTime = new Date();
	var time = currentTime.getTime();

	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){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4){
			var response = ajaxRequest.responseText;

			if (check_type == "username"){
				if (response == "good" && obj_val.length > 3){
					span_obj.innerHTML = "<img src='images/reg_check.png' />";
				}else{
					span_obj.innerHTML = "<img src='images/reg_nocheck.png' /> Not available/Too short";
				}
			}else if (check_type == "email"){
				var filter = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
				if (response == "good" && filter.test(obj_val)){
					span_obj.innerHTML = "<img src='images/reg_check.png' />";
				}else{
					span_obj.innerHTML = "<img src='images/reg_nocheck.png' /> Invalid/Existing";
				}
			}
		}
	}

	var queryString = "?check_type="+escape(check_type)+"&value="+escape(obj_val)+"&time="+time;
	ajaxRequest.open("GET", "./reg_checks.php" + queryString, true);
	ajaxRequest.send(null);
}