var baseNameId = 0, menuImageNr=1, timerID=null, timerRunning=false, randomImage=false;
var bid=0;
var menuImageLocation = new Array();
var menuImagePre = new Image();
var myLayers = new Array();
var mylid=0;
var specificNr=null

menuImageLocation[0] = new Array("japan",3);
menuImageLocation[1] = new Array("africa",4);
menuImageLocation[2] = new Array("aisa",4);
menuImageLocation[3] = new Array("start",2);
menuImageLocation[3] = new Array("nsm",7);
//menuImageLocation[4] = new Array("filename",#of images);

function getRandom(min,max)
{
   return Math.round(Math.random()*(max-min))+min;
}

function changeMenuImage()
{
	if (document.images)
	{
		baseNameId=getRandom(0,menuImageLocation.length-1);
		menuImageNr=getRandom(1,menuImageLocation[baseNameId][1]);
		if (menuImageNr > menuImageLocation[baseNameId][1]) menuImageNr = 1;
		if (document.images.menuImage) document.images.menuImage.src='http://www.9th-hennepin.com/HPA/images/' + menuImageLocation[baseNameId][0] + menuImageNr + '.jpg';

		if (true==randomImage)
		{
			baseNameId=getRandom(0,menuImageLocation.length-1);
			menuImageNr=getRandom(1,menuImageLocation[baseNameId][1]);
		}
		else
			++menuImageNr;
		if (menuImageNr > menuImageLocation[baseNameId][1]) menuImageNr = 1;
		if (document.images.menuImagePre) document.images.menuImagePre.src='http://www.9th-hennepin.com/HPA/images/' + menuImageLocation[baseNameId][0] + menuImageNr + '.jpg';
		timerID=setTimeout("changeMenuImage()",15000);
		timerRunning=true;
	}
}

function showMenuImage(baseImageName, specificNr)
{
	var i;
	if (timerRunning)
	{
		clearTimeout(timerID);
		timerRunning=false;
	}
	if (baseImageName)
	{
		for(i=0;(i<menuImageLocation.length) && (menuImageLocation[i][0]!=baseImageName);i++);
		if (i==menuImageLocation.length)
		{
			baseNameId=getRandom(0,menuImageLocation.length-1);
			menuImageNr=getRandom(1,menuImageLocation[baseNameId][1]);
			randomImage=true;
		} else
		{
			baseNameId=i;
			randomImage=false;
			if (specificNr) menuImageNr=specificNr;
		}
	}
	changeMenuImage();
}

function init_page()
{
    specificNr=0;
	showMenuImage('start',1);
}