var currentStudentPic = 0;
var nextStudentPic = 2;
var lastStudentPic = -1;

var currentSalePic = 0;
var nextSalePic = 2;
var lastSalePic = -1;

var currentLetPic = 0;
var nextLetPic = 2;
var lastLetPic = -1;


function nextCarousel(type)
{
	
	var currentPos = -1;
	var nextPos = -1
	var lastPos = -1;
	var leftButton;
	var rightButton;
	var showcase;
	var valid = false; 
	
	if (type == "student")
	{
		currentPos = currentStudentPic;
		nextPos = nextStudentPic;
		lastPos = lastStudentPic;
		leftButton = $('a#studentlets_left');
		rightButton = $('a#studentlets_right');
		showcase = $('ul#student-showcase');
		valid = true;
	}
	else if (type == "sales")
	{
		currentPos = currentSalePic;
		nextPos = nextSalePic;
		lastPos = lastSalePic;
		leftButton = $('a#sales_left');
		rightButton = $('a#sales_right');
		showcase = $('ul#sales-showcase');
		valid = true;
	}
	else if (type == "let")
	{
		currentPos = currentLetPic;
		nextPos = nextLetPic;
		lastPos = lastLetPic;
		leftButton = $('a#lettings_left');
		rightButton = $('a#lettings_right');
		showcase = $('ul#let-showcase');
		valid = true;
	}
	
	if (valid)
	{
		if (currentPos >= lastPos)
		{
			return;
		}
		
		//go to next pic, show arrow.
		currentPos++;
		$(leftButton).show();
		$(showcase).animate({marginLeft: '-=390px'}, 1);
		//next pic is last
		if (currentPos == lastPos)
		{	
			//hide right arrow;
			$(rightButton).hide();
			nextPos = -1;
		}
		
		if ((currentPos+1) == nextPos)
		{
			var linksrc = $(showcase).find('li').eq(currentPos+1).find('span.image_link').text();
			$(showcase).find('li div.feature').eq(currentPos+1).children('span.image_link').remove();
			
			var linkalt = $(showcase).find('li').eq(currentPos+1).find('span.image_alt').text();
			$(showcase).find('li div.feature').eq(currentPos+1).children('span.image_alt').remove();
			
			$(showcase).find('li div.feature').eq(currentPos+1).prepend('<img src="'+linksrc+'" alt="'+linkalt+'" />');
			nextPos++;
			if (nextPos > lastPos)
			{
				nextPos = -1;
			}
		}
	}
	
	if (type == "student")
	{
		currentStudentPic = currentPos;
		nextStudentPic = nextPos;
	}
	else if (type == "sales")
	{
		currentSalePic = currentPos;
		nextSalePic = nextPos;
	}
	else if (type == "let")
	{
		currentLetPic = currentPos;
		nextLetPic = nextPos
	}
}

function prevCarousel(type)
{
	
	var currentPos = -1;
	var nextPos = -1
	var lastPos = -1;
	var leftButton;
	var rightButton;
	var showcase;
	var valid = false; 
	
	if (type == "student")
	{
		currentPos = currentStudentPic;
		leftButton = $('a#studentlets_left');
		rightButton = $('a#studentlets_right');
		showcase = $('ul#student-showcase');
		valid = true;
	}
	else if (type == "sales")
	{
		currentPos = currentSalePic;
		leftButton = $('a#sales_left');
		rightButton = $('a#sales_right');
		showcase = $('ul#sales-showcase');
		valid = true;
	}
	else if (type == "let")
	{
		currentPos = currentLetPic
		leftButton = $('a#lettings_left');
		rightButton = $('a#lettings_right');
		showcase = $('ul#let-showcase');
		valid = true;
	}
	
	if (valid)
	{
		if (currentPos <= 0)
		{
			return;
		}
		//go to next pic, show arrow.
		currentPos--;
		$(rightButton).show();
		$(showcase).animate({marginLeft: '+=390px'}, 1);
		if (currentPos == 0)
		{
			$(leftButton).hide();
		}
	}
	
	if (type == "student")
	{
		currentStudentPic = currentPos;
	}
	else if (type == "sales")
	{
		currentSalePic = currentPos;
	}
	else if (type == "let")
	{
		 currentLetPic = currentPos;
	}
}