Create like a god. Command like a king. Work like a slave.

//found@http://www.daniweb.com/forums/post742619.html#post742619
 
/**
 * Netscape compatible WaitForDelay function.
 * You can use it as an alternative to Thread.Sleep() in any major programming language
 * that support it while <strong class="highlight">JavaScript</strong> it self doesn't have any built-in function to do such a thing.
 * parameters:
 *  (Number) delay in millisecond
 */
function nsWaitForDelay(delay) {
	/**
	 * Just uncomment this code if you're building an extention for Firefox.
	 * Since FF3, we'll have to ask for user permission to execute XPCOM objects.
	 */
	netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
 
	// Get the current thread.
	var thread = Components.classes["@mozilla.org/thread-manager;1"].getService(Components.interfaces.nsIThreadManager).currentThread;
 
	// Create an inner property to be used later as a notifier.
	this.delayed = true;
 
	/*
	 * Call <strong class="highlight">JavaScript</strong> setTimeout function
	 * to execute this.delayed = false after it finish.
	 */
	setTimeout("this.delayed = false;", delay);
 
	/**
	 * Keep looping until this.delayed = false
	 */
	while (this.delayed) {
		/**
		 * This code will not freeze your browser as it's documented in here:
		 * https://developer.mozilla.org/en/Code_snippets/Threads#Waiting_for_a_background_task_to_complete
		 */
		thread.processNextEvent(true);
	}
}
 
//i use it for ff-extension-.synchronous http-calls, which would freeze, but not with this workaround
function makeRequest(url) {
	netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
	// Get the current thread.
	var thread = Components.classes["@mozilla.org/thread-manager;1"].getService(Components.interfaces.nsIThreadManager).currentThread;
	// Create an inner property to be used later as a notifier.
	this.delayed = true;
 
	var retHtml	= '';
	$mb = jQuery.noConflict();
	$mb.ajax({
		url: url,
		async: true,
		dataType: "html",
		success: function (data) {
			retHtml	= data;
			delayed	= false;
		}
	});
	while (this.delayed) {
		/**
		 * This code will not freeze your browser as it's documented in here:
		 * https://developer.mozilla.org/en/Code_snippets/Threads#Waiting_for_a_background_task_to_complete
		 */
		thread.processNextEvent(true);
	}
	return retHtml;
}