function ajexconnect()
{

	var ajex;
	var browser=navigator.appName;
	
	if(browser == "Microsoft Internet Explorer")
	{
		ajex = new ActiveXObject("microsoft.XMLHTTP");
	}
	else
	{
		ajex = new XMLHttpRequest();
	}
	return ajex;
	
}

var http = ajexconnect();

//------------------------------------------------------------------------------------------
function StateCity(stateid)
{
	http.open('get', 'city.php?stateid='+stateid);
	http.onreadystatechange = GetCityResponse;
	http.send(null);
}
	
function GetCityResponse()
{		
	if(http.readyState == 4)
	{
		var response = http.responseText;
		document.getElementById("CityID").innerHTML = response;
	}
}
function CityExhib(stateid)
{
	http.open('get', 'user.php?cityid='+stateid);
	http.onreadystatechange = GetCityExhib;
	http.send(null);
}
	
function GetCityExhib()
{		
	if(http.readyState == 4)
	{
		var response = http.responseText;
		document.getElementById("Exhib").innerHTML = response;
	}
}

function isValidEmail(emailStr)
{
var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null) {
		return "Email address seems incorrect (check @ and .'s)";
		//alert("Email address seems incorrect (check @ and .'s)");
		//return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	// Start by checking that only basic ASCII characters are in the strings (0-127).
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			return "Ths username contains invalid characters.";
			//return false;
		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			return "Ths domain name contains invalid characters.";
			//return false;
		}
	}
	if (user.match(userPat)==null) {
		return "The username doesn't seem to be valid.";
		//return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				return "Destination IP address is invalid!";
				//return false;
	   		}
		}
		
		}
return false;		
}