var count1 = 42;
var count2 = 10;
var count3 = 19;
var count4 = 6;

function showShot1(img)
{

var screenWidth1		=	(screen.width - 640) / 2;
var screenHeight1	=	(screen.height - 554) / 2;

page = "http://www.lucasarts.com/products/starwarsstarfighter/screenShot.jsp?num=" + count1;
window.open(page,'','scrollbars=0,height=554,width=640,top='+screenHeight1+',left='+screenWidth1+'');
}

function forwardScreen1(img)
{
		count1 = count1 - 1;
		 if(count1 == 0)
			count1 = 42;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/screenshots/ps2/" + count1 + ".jpg";

}

function backScreen1(img)
{
		count1 = count1 + 1;
		 if(count1 == 43)
			count1 = 1;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/screenshots/ps2/" + count1 + ".jpg";

}

function showShot2(img)
{

var screenWidth2		=	(screen.width - 640) / 2;
var screenHeight2	=	(screen.height - 554) / 2;

page = "http://www.lucasarts.com/products/starwarsstarfighter/conceptArt.jsp?num=" + count2;
window.open(page,'','scrollbars=0,height=554,width=640,top='+screenHeight2+',left='+screenWidth2+'');
}

function forwardScreen2(img)
{
		count2 = count2 - 1;
		 if(count2 == 0)
			count2 = 10;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/concepts/" + count2 + ".jpg";

}

function backScreen2(img)
{
		count2 = count2 + 1;
		 if(count2 == 11)
			count2 = 1;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/concepts/" + count2 + ".jpg";

}


function showShot3(img)
{

var screenWidth3		=	(screen.width - 640) / 2;
var screenHeight3	=	(screen.height - 554) / 2;

page = "http://www.lucasarts.com/products/starwarsstarfighter/screenShotXbox.jsp?num=" + count3;
window.open(page,'','scrollbars=0,height=554,width=640,top='+screenHeight3+',left='+screenWidth3+'');
}

function forwardScreen3(img)
{
		count3 = count3 - 1;
		 if(count3 == 0)
			count3 = 19;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/screenshots/xbox/" + count3 + "s.jpg";

}

function backScreen3(img)
{
		count3 = count3 + 1;
		 if(count3 == 20)
			count3 = 1;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/screenshots/xbox/" + count3 + "s.jpg";

}


function showShot4(img)
{

var screenWidth4		=	(screen.width - 640) / 2;
var screenHeight4	=	(screen.height - 554) / 2;

page = "http://www.lucasarts.com/products/starwarsstarfighter/screenShotPC.jsp?num=" + count4;
window.open(page,'','scrollbars=0,height=554,width=640,top='+screenHeight4+',left='+screenWidth4+'');
}

function forwardScreen4(img)
{
		count4 = count4 - 1;
		 if(count4 == 0)
			count4 = 6;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/screenshots/pc/" + count4 + "s.jpg";

}

function backScreen4(img)
{
		count4 = count4 + 1;
		 if(count4 == 7)
			count4 = 1;

	document[img].src = "http://www.lucasarts.com/products/starwarsstarfighter/images/gallery/screenshots/pc/" + count4 + "s.jpg";

}