var jsIncludeFiles = [];

// Include a JavaScript file.  Functions like include_once per PHP.
// Used a lot of information from Stoyan's blog:
// http://www.phpied.com/javascript-include-ready-onload/
function include(file) {
	var htmlElem = document.getElementsByTagName('head')[0];
	var js = document.createElement('script');

	js.setAttribute('language', 'JavaScript');
	js.setAttribute('type', 'text/javascript');
	js.setAttribute('src', file);

	// On Firefox, js.src is the fully qualified URL, IE it stays verbatim
	if (jsIncludeFiles[js.src]) {
		return;
	}

	// IE
	js.onreadystatechange = function() {
		if (js.readyState == 'complete' || js.readyState == 'loaded') {
			includeDone(js);
		}
	}

	if (js.addEventListener) {
		// Everything that supports the DOM2 event model
		// This should cover Firefox, Opera 9.2 and Safari
		js.addEventListener('load', includeDone, false);
	} else {
		// This may work for other browsers, such as older Mozilla-based
		// ones and perhaps older Safari versions
		js.onload = includeDone;
	}

	jsIncludeFiles[js.src] = 'loading';

	htmlElem.appendChild(js);
}

// Called when an include file has loaded
function includeDone(thisObj) {
	// IE will pass the script node, Firefox and others pass the Event.
	if (thisObj.target) {
		// Event was passed, pick out the script node
		thisObj = thisObj.target;
	}
	if (jsIncludeFiles[thisObj.src]) {
		jsIncludeFiles[thisObj.src] = 'ready';
	}
	thisObj.parentNode.removeChild(thisObj);
	if (! includeIsLoading()) {
		onloadQueueProcess();
	}
}

function includeIsLoading() {
	for (var file in jsIncludeFiles) {
		if (jsIncludeFiles[file] == 'loading') {
			return true;
		}
	}
	return false;
}