var state_list = ["All", "AL", "AK", "AS", "AZ", "AR", "CA", "CO", "CT", "DE", "DC", "FM", "FL", "GA", "GU", "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MH", "MD", "MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ", "NM", "NY", "NC", "ND", "MP", "OH", "OK", "OR", "PW", "PA", "PR", "RI", "SC", "SD", "TN", "TX", "UT", "VT", "VI", "VA", "WA", "WV", "WI", "WY", "AA", "AE", "AP"];

function InternetExplorerVersion() {
    var rv = -1; // Return value assumes failure.
    if (navigator.appName == 'Microsoft Internet Explorer') {
        var ua = navigator.userAgent;
        var re = /MSIE ([0-9]{1,}[\.0-9]{0,})/;
        if (re.exec(ua) !== null) {
            rv = parseFloat(RegExp.$1);
	}
    }
    return rv;
}

var req = new XMLHttpRequest();

function ProcessCongressMember() {
    if (req.readyState != 4 || req.status != 200) {
	return;
    }
    var econgress = document.getElementsByName("congress");
    if (econgress === null || econgress.length < 1) {
	return;
    }
    econgress = econgress[0];
    var i = 0;
    for (; i < econgress.options.length; i++) {
	if (econgress.options[i].value != req.responseText) {
	    continue;
	}
	econgress.selectedIndex = i;
	break;
    }
}

function RequestCongress() {
    var eaddr = document.getElementById("address");
    var ecity = document.getElementById("city");
    var estate = document.getElementById("state");
    var ezip = document.getElementById("zip");
    var state =  estate.options[estate.selectedIndex].value.substr(0, 2);
    if (estate.selectedIndex === 0) {
	state = "";
    }
    var params = "address=" + eaddr.value + "&city=" + ecity.value + "&state=" + state + "&zip=" + ezip.value;
    req.onreadystatechange = ProcessCongressMember;
    req.open("POST", "ms2011_congress_lookup.php", true);
    req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    req.send(params);
}

function ChangePayCategory() {
    var eregular = document.getElementById("pay_category_r");
    var estudent = document.getElementById("pay_category_s");
    var ename = document.getElementById("pay_item_name");
    var edesc = document.getElementById("pay_item_desc");
    var eprice = document.getElementById("pay_item_price");
    if (eregular.checked) {
	ename.value = "Regular Registration";
	edesc.value = "March Storm 2011 Regular Registration";
	eprice.value = "100.0";
    }
    else if (estudent.checked) {
	ename.value = "Student Registration";
	edesc.value = "March Storm 2011 Student Registration";
	eprice.value = "25.0";
    }
    else {
	ename.value = "Annual Dues";
	edesc.value = "ProSpace Annual Membership Dues";
	eprice.value = "25.0";
    }
}

function ChangeVeteran() {
    var eveteran = document.getElementById("veteran_y");
    var eattended = document.getElementById("attended");
    if (eveteran.checked) {
	eattended.disabled = false;
    }
    else {
	eattended.value = "";
	eattended.disabled = true;
    }
}

function ChangeCongressState() {
    var MSIE = InternetExplorerVersion();
    if (MSIE != -1 && MSIE < 8.0) {
	return;
    }
    var econgress_state = document.getElementById("congress_state");
    if (econgress_state === null) {
	return;
    }
    var myindex  = econgress_state.selectedIndex;
    var SelValue = econgress_state.options[myindex].value;
    var i = 0;
    for (; i < state_list.length; i++) {
	var e = document.getElementById("congress_" + state_list[i]);
	if (e === null) {
	    continue;
	}
	if (state_list[i] == SelValue) {
	    e.className = null;
	    e.name = "congress";
	    e.disabled = false;
	}
	else {
	    e.className = "hidden";
	    e.name = null;
	    e.disabled = true;
	}
    }
    
    return;
}

function ChangeState() {
    var MSIE = InternetExplorerVersion();
    if (MSIE != -1 && MSIE < 8.0) {
	return;
    }
    var myindex  = document.getElementById("state").selectedIndex;
    var SelValue = document.getElementById("state").options[myindex].value.substr(0, 2);
    var econgress_state = document.getElementById("congress_state");
    if (econgress_state === null) {
	return;
    }
    var curcstate = econgress_state.selectedIndex;
    var i = 0;
    for (; i < econgress_state.options.length; i++) {
	if (econgress_state.options[i].value != SelValue) {
	    continue;
	}
	if (curcstate != i) {
	    RequestCongress();
	}
	econgress_state.selectedIndex = i;
	break;
    }
    ChangeCongressState();
}

function EnableCongressSelection() {
    var eattended = document.getElementById("attended");
    if (eattended === null) {
	return;
    }
    eattended.disabled = true;
    var epayform = document.getElementById("pay_form");
    epayform.className = null;
    
    var MSIE = InternetExplorerVersion();
    if (MSIE != -1 && MSIE < 8.0) {
	return;
    }
    
    var e = document.getElementById("congress_state");
    if (e !== null) {
	e.className = null;
	e.disabled = false;
    }
    var i = 0;
    for (; i < state_list.length; i++) {
	var ec = document.getElementById("congress_" + state_list[i]);
	if (ec === null) {
	    continue;
	}
	ec.disabled = false;
    }
    ChangeCongressState();
}