// newsfeed.js
// requires functions: changeOpac, opacity, WriteByID

var curNewsIndex = 0;
var newsTarget = 'newsfeedContent';
var fadeInTime = 500;
var fadeOutTime = 500;
var displayTime = 15000;
var growTime = 250;

function newsfeed_init() {
	if (news != "undefined" && news.length > 0) {
		curNewsIndex = Math.round(Math.random()*(news.length-1));
		prep_height();
	}
}

function prep_height() {
	
	var ht = 20;
	if (document.getElementById(newsTarget).style.height) {
		ht = document.getElementById(newsTarget).style.height.replace("px","");
	}
	wd = document.getElementById(newsTarget).style.width.replace("px","");
	content = news[curNewsIndex];
	content = '<div style="position:relative; width:'+wd+'px;">'+content+'</div>';
	WriteByID('hTester',null,'');
	WriteByID('hTester',null,content);
	new_ht = parseInt(document.getElementById('hTester').offsetHeight);		
	growY(newsTarget, ht, (0 + new_ht), growTime);	
	setTimeout("display_news()",growTime);
}

function display_news() {
	changeOpac(0, newsTarget);
	WriteByID(newsTarget,null,news[curNewsIndex]);
	opacity(newsTarget, 0, 100, fadeInTime);
	setTimeout("change_news()",Number(displayTime + fadeInTime));
	
}

function change_news() {
	if (curNewsIndex >= news.length - 1) {
		curNewsIndex = 0;
	} else {
		curNewsIndex++;	
	}
	opacity(newsTarget, 100, 0, fadeOutTime);
	setTimeout("prep_height()",fadeOutTime);
}