//layer visibility functions
function toggleLayer(obj) {
    if(document.getElementById(obj).style.visibility == "visible") {
	    document.getElementById(obj).style.visibility = "hidden";
	    document.getElementById(obj).style.display = "none";
    }
    else {
document.getElementById(obj).style.visibility = "visible";
	    document.getElementById(obj).style.display = "";
    }
}
function hideLayer(obj) {
	    document.getElementById(obj).style.visibility = "hidden";
	    document.getElementById(obj).style.display = "none";
    } 
function showLayer(obj) {
	document.getElementById(obj).style.visibility = "visible";
	document.getElementById(obj).style.display = "";
}

// youtube play function
function playVideo(id, height, width, location) {
	switch (location) {
		default:
			document.getElementById('mainvideo').innerHTML = '<embed align="left" class="videoObject" src="http://www.youtube.com/v/' + id + '&rel=0&autoplay=1" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="' + width + 'px" height="' + height + 'px" wmode="transparent"></embed>';
	}
}

//ajax stuff
var bustcachevar=1 //bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadedobjects=""
var rootdomain="http://"+window.location.hostname
var bustcacheparameter=""

function ajaxpage(url, cid){
var page_request = false
if (window.XMLHttpRequest) // if Mozilla, Safari etc
page_request = new XMLHttpRequest()
else if (window.ActiveXObject){ // if IE
try {
page_request = new ActiveXObject("Msxml2.XMLHTTP")
} 
catch (e){
try{
page_request = new ActiveXObject("Microsoft.XMLHTTP")
}
catch (e){}
}
}
else
return false
page_request.onreadystatechange=function(){
loadpage(page_request, cid)
}
if (bustcachevar) //if bust caching of external page
bustcacheparameter=(url.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
page_request.open('GET', url+bustcacheparameter, true)
page_request.send(null)
}

function loadpage(page_request, cid){
if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1))
document.getElementById(cid).innerHTML=page_request.responseText
}

function loadobjs(){
if (!document.getElementById)
return
for (i=0; i<arguments.length; i++){
var file=arguments[i]
var fileref=""
if (loadedobjects.indexOf(file)==-1){ //Check to see if this object has not already been added to page before proceeding
if (file.indexOf(".js")!=-1){ //If object is a js file
fileref=document.createElement('script')
fileref.setAttribute("type","text/javascript");
fileref.setAttribute("src", file);
}
else if (file.indexOf(".css")!=-1){ //If object is a css file
fileref=document.createElement("link")
fileref.setAttribute("rel", "stylesheet");
fileref.setAttribute("type", "text/css");
fileref.setAttribute("href", file);
}
}
if (fileref!=""){
document.getElementsByTagName("head").item(0).appendChild(fileref)
loadedobjects+=file+" " //Remember this object as being already added to page
}
}
}

//ajax post functions
var http_request = false;
function makePOSTRequest(url, parameters, callback_func, targetDiv) {
if (typeof(targetDiv)=="undefined")
targetDiv = 'response_div';
	http_request = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			// set type accordingly to anticipated content type
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
		}
		} else if (window.ActiveXObject) { // IE
			try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
				} catch (e) {
					try {
						http_request = new ActiveXObject("Microsoft.XMLHTTP");
					} catch (e) {}
					}
				}
				if (!http_request) {
					alert('Cannot create XMLHTTP instance');
					return false;
				}

		http_request.onreadystatechange = function() { 
		  		if (http_request.readyState == 4) {
					if (http_request.status == 200) {
					result = http_request.responseText;
					document.getElementById(targetDiv).innerHTML = result;
					if (callback_func)
			    		setTimeout(callback_func,10);
					} else {
						alert('There was a problem with the request.');
					}
				}
	    }
		
		http_request.open('POST', url, true);
		http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http_request.setRequestHeader("Content-length", parameters.length);
		http_request.setRequestHeader("Connection", "close");
		http_request.send(parameters);
	}

function ifEmptyThenDisplay(field, cid) {
if (field.value.length == 0)
{
	if (document.getElementById(cid).style.visibility != "visible")
	{
	showLayer(cid);
	invalidform = invalidform+1;
	disableForm();
 }
 	return false;
}
else
{
	if (document.getElementById(cid).style.visibility == "visible")
	{
	hideLayer(cid);
	invalidform = invalidform-1;
	if (invalidform == 0)
	{
	enableForm();
  }
  }
  return true;
}
}