function GetXmlHttpObject(){
	var xmlHttp=null;
	try{
		xmlHttp=new XMLHttpRequest();
	}
	catch (e){
		try{	
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e){
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}

function showAnnouncements(type){
	//make sure user's browser can handle ajax
	xmlHttp = GetXmlHttpObject();		
	if (xmlHttp==null){
		document.getElementById(photos).innerHTML = "Browser does not support AJAX.  Please make sure that your browser is up to date and that JavaScript is enabled.";
		return;
	}
	
	switch(type){
		case 'engagements':
		default:
			document.getElementById('weddingImage').src='assets/but_wedding.jpg';
			document.getElementById('engagementImage').src='assets/but_engagement_over.jpg';
			break;
		case 'weddings':
			document.getElementById('engagementImage').src='assets/but_engagement.jpg';
			document.getElementById('weddingImage').src='assets/but_wedding_over.jpg';
			break;
	}
	
	var url = 'scripts/ajax/getAnnouncementsContent.php?type=' + type + '&sid=' + Math.random();
	xmlHttp.onreadystatechange=displayAnnouncementsInfo
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function displayAnnouncementsInfo(){
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
		document.getElementById("announcements").innerHTML=xmlHttp.responseText
	}
	else{
		document.getElementById("announcements").innerHTML='<div style="color:#8A3C49;"><br /><img src="assets/ajax-loader.gif" />&nbsp;Loading...</div>'
	}	
}