// JavaScript Document

function getEmailInfo(email) {
	
	var responseTxt;
	
	xmlHttp = GetXmlHttpObject();
	
	if (xmlHttp == null) {
		alert("Your browser does not support AJAX");
		return;
	}

	var url = "getEmail.asp?email=" + email +"&cache=" + Math.floor(Math.random()*10000);
	xmlHttp.onreadystatechange = stateChangedRegister;
	xmlHttp.open("GET", url, true);
	xmlHttp.send(null);	
}

function stateChangedRegister() {
	if (xmlHttp.readyState == 4) {
				
		responseTxt = xmlHttp.responseText;

		if (responseTxt == "Fail") {
			document.getElementById("registerResponse").innerHTML = '<p>Email already exists! Please enter another email address</p>';
			document.getElementById("registerResponse").style.display = 'block';
			document.getElementById('register').disabled = true;			
		} else {
			document.getElementById("registerResponse").style.display = 'none';
			document.getElementById('register').disabled = false;			
		}
		
	}
}

function GetXmlHttpObject() {
	var xmlHttp=null;
	try {
	  // Firefox, Opera 8.0+, Safari
	  xmlHttp=new XMLHttpRequest();
	}
	catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}

function URLEncode(plaintext) {
	// The Javascript escape and unescape functions do not correspond
	// with what browsers actually do...
	var SAFECHARS = "0123456789" +					// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
		if (ch == " ") {
			encoded += "+";				// x-www-urlencoded, rather than %20
		} else if (SAFECHARS.indexOf(ch) != -1) {
			encoded += ch;
		} else {
			var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
			   /* alert( "Unicode Character '" 
						+ ch 
						+ "' cannot be encoded using standard URL encoding.\n" +
						  "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted." ); */
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	} // for
	return encoded;
};