var preloadFlag = false;
var timer = null;
var gamma_images = new Array(4);
var gamma_cur = 1;
var TIME_OUT = 6000;

function MM_checkPlugin(plgIn, theURL, altURL, autoGo) { //v4.0
  var ok=false; document.MM_returnValue = false;
  with (navigator) if (appName.indexOf('Microsoft')==-1 || (plugins && plugins.length)) {
    ok=(plugins && plugins[plgIn]);
  } else if (appVersion.indexOf('3.1')==-1) { //not Netscape or Win3.1
    if (plgIn.indexOf("Flash")!=-1 && window.MM_flash!=null) ok=window.MM_flash;
    else if (plgIn.indexOf("Director")!=-1 && window.MM_dir!=null) ok=window.MM_dir;
    else ok=autoGo; }
  if (!ok) theURL=altURL; if (theURL) window.location=theURL;
}

function newImage(arg)
{
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages()
{
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

function init()
{
	preloadImages()
	timer = setTimeout("start()",TIME_OUT);
}

function preloadImages()
{
	if (document.images) {
		overview_o = newImage("overview_o.jpg");
		history_o = newImage("history_o.jpg");
		gamma_knife_o = newImage("gammaknife_o.jpg");
		partners_o = newImage("partners_o.jpg");
		services_o = newImage("services_o.jpg");
		management_o = newImage("management_o.jpg");
		financials_o = newImage("financials_o.jpg");
		gamma_1 = newImage("gamma_1.jpg");
		gamma_2 = newImage("gamma_2.jpg");
		gamma_3 = newImage("gamma_3.jpg");
		gamma_4 = newImage("gamma_4.jpg")
		preloadFlag = true;
	}
}

function start()
{
	changeImages('gamma_image', "gamma_"+gamma_cur+".jpg");
	gamma_cur = (gamma_cur>3) ? 1 : (gamma_cur+1);
	timer = setTimeout("start()",TIME_OUT);
}

function stop()
{
	clearTimeout(timer);
}