var screenx = screen.width;
var screeny = screen.height;

var topmarginheight;

if(screenx <= 800)
{
	topmarginheight = 5;
}
else
{
	topmarginheight = 90;
}

function settopmargin()
{
	if(document.all)
	{
		topmargin.height=topmarginheight;
	}
	else
	{
		document.getElementById("topmargin").height = topmarginheight;
	}
}

function swapimage(idtoput, imageurl)
{
	document.getElementById(idtoput).src = imageurl;
}



function scrollleft()
{
	slider.left = parseInt(slider.left) + shiftamount + "px";
	if(parseInt(slider.left) > 0)
	{
		slider.left = parseInt(slider.left) - photowidth + "px";
	}
	
	if(!scroll) clearTimeout(timer);
	else timer = setTimeout("scrollleft()",timerinterval);
}

function scrollright()
{	
	slider.left = parseInt(slider.left) - shiftamount + "px";
	if(parseInt(slider.left) < -2*photowidth + viewwidth)
	{
		slider.left = parseInt(slider.left) + photowidth + "px";
	}
	
	if(!scroll) clearTimeout(timer);
	else timer = setTimeout("scrollright()",timerinterval);
}

function changephoto(src)
{
	loader.style.visibility = "visible";
	leftimage.visibility = "visible";
	rightimage.visibility = "visible";
	photo1.src = src;
	photo2.src = src;
	slider.left = 0 + "px";
	slider.width = 2*photowidth + "px";
}

function scrollup()
{
	if(parseInt(slider.top) >= -661 && scroll)
	{
		slider.top = parseInt(slider.top) - shiftamount + "px";
		upimage.visibility = 'visible';
	}
	else
	{
		if(parseInt(slider.top) <= -661) downimage.visibility = 'hidden';
		scroll = false;
	}
	
	if(!scroll) clearTimeout(timer);
	else timer = setTimeout("scrollup()",timerinterval);
}

function scrolldown()
{	
	if(parseInt(slider.top) < 0 && scroll)
	{
		downimage.visibility = 'visible';
		slider.top = parseInt(slider.top) + shiftamount + "px";
	}
	else
	{
		if(parseInt(slider.top) == 0) upimage.visibility = 'hidden';
		scroll = false;
	}
	
	if(!scroll) clearTimeout(timer);
	else timer = setTimeout("scrolldown()",timerinterval);
}

function changephoto_photo(src)
{
	loader.style.visibility = "visible";
	photo.src = src;
}