var random;
var image;
var randomprev;
var imageprev;
var randomnext;
var imagenext;

var randomImages = new Array();
var arrayLength;

function initRandomImagesHome()
{
	randomImages[0] 		= '../rescue/images/reference/Norg/Norg_welcome_01.jpg';
	randomImages[1] 		= '../rescue/images/reference/Norg/Norg_welcome_02.jpg';
	randomImages[2] 		= '../rescue/images/reference/garding/Garding_welcome_01.jpg';
	randomImages[3] 		= '../rescue/images/reference/garding/Garding_welcome_02.jpg';
	randomImages[4] 		= '../rescue/images/reference/garding/Garding_welcome_03.jpg';
	randomImages[5] 		= '../rescue/images/reference/wil/Wil_welcome_01.jpg';
	randomImages[6] 		= '../rescue/images/reference/wil/Wil_welcome_02.jpg';
	randomImages[7] 		= '../rescue/images/reference/wil/Wil_welcome_03.jpg';
	randomImages[8] 		= '../rescue/images/reference/wil/Wil_welcome_04.jpg';
	randomImages[9] 		= '../rescue/images/welcome/Welcome_Image_01.jpg';
	randomImages[10] 		= '../rescue/images/welcome/Welcome_Image_02.jpg';
	randomImages[11] 		= '../rescue/images/welcome/Welcome_Image_03.jpg';
	randomImages[12] 		= '../rescue/images/welcome/Welcome_Image_04.jpg';
	randomImages[13] 		= '../rescue/images/welcome/Welcome_Image_05.jpg';
	randomImages[14] 		= '../rescue/images/welcome/Welcome_Image_06.jpg';
	randomImages[15] 		= '../rescue/images/welcome/Welcome_Image_07.jpg';
	randomImages[16] 		= '../rescue/images/welcome/Welcome_Image_08.jpg';
	randomImages[17] 		= '../rescue/images/welcome/Welcome_Image_09.jpg';
	randomImages[18] 		= '../rescue/images/welcome/Welcome_Image_10.jpg';
	randomImages[19] 		= '../rescue/images/welcome/Welcome_Image_11.jpg';
	randomImages[20] 		= '../rescue/images/welcome/Welcome_Image_12.jpg';
	randomImages[21] 		= '../rescue/images/welcome/Welcome_Image_13.jpg';
	randomImages[22] 		= '../rescue/images/welcome/Welcome_Image_14.jpg';
	randomImages[23] 		= '../rescue/images/welcome/Welcome_Image_15.jpg';
	randomImages[24] 		= '../rescue/images/welcome/Welcome_Image_16.jpg';
	randomImages[25] 		= '../rescue/images/welcome/Welcome_Image_17.jpg';
}

function randomImage(p_sPage)
{
	switch(p_sPage)
	{
		case 'home':
			initRandomImagesHome();
		break;
	}
	
	arrayLength = randomImages.length;
	
	random = Math.round(Math.random()*(arrayLength-1));
	image = randomImages[random];
	randomprev = random - 1;
	randomnext = random + 1;
	document.getElementById("randomImage").setAttribute("src",image);
	
	if(random==0)
	{
		var previmage = document.getElementById("prevrandom");
		previmage.style.visibility="hidden";
	}
	else if(random==(arrayLength-1))
	{
		var nextimage = document.getElementById("nextrandom");
		nextimage.style.visibility="hidden";
	}
}

function prev()
{	
	if(randomprev<0)
	{
		return false;
	}
	if(randomprev==0)
	{
		var prevrandom = document.getElementById("prevrandom");
		prevrandom.style.visibility="hidden";
	}
		
	imageprev = randomImages[randomprev];
	document.getElementById("randomImage").setAttribute("src",imageprev);
	randomnext = randomprev;
	randomprev = randomprev-1;
	randomnext = randomnext+1;
	
	if(randomnext<=(arrayLength-1))
	{
		var nextimage = document.getElementById("nextrandom");
		nextimage.style.visibility="visible";
	}
}

function next()
{
	if(randomnext>(arrayLength-1))
	{
		return false;
	}
	
	if(randomnext==(arrayLength-1))
	{
		var nextimage = document.getElementById("nextrandom");
		nextimage.style.visibility="hidden";
	}
	
	imagenext = randomImages[randomnext];
	document.getElementById("randomImage").setAttribute("src",imagenext);
	randomprev = randomnext;
	randomnext = randomnext+1;
	randomprev = randomprev-1;
	
	if(randomprev==0)
	{
		var prevrandom = document.getElementById("prevrandom");
		prevrandom.style.visibility="visible";
	}
	else if(randomprev>0)
	{
		var previmage = document.getElementById("prevrandom");
		previmage.style.visibility="visible";
	}
}