function calculateBackground()
{
var viewPortHeight = $(window).height();
if(viewPortHeight < 580) viewPortHeight = 580;
var viewCenter = (viewPortHeight / 2);
$('#white_back, #white_tribal').css({
height: viewCenter+'px',
top: viewCenter+'px'
});
$('#black_back, #black_tribal').css({
height: viewCenter+'px',
top: '0px'
});
}

function calculateContent()
{
var viewPortHeight = $(window).height();
var viewPortWidth = $(window).width();
if(viewPortHeight < 580) viewPortHeight = 580;
if(viewPortWidth < 972) viewPortWidth = 972;
var viewCenter = viewPortHeight / 2;
var contentTop = viewCenter - 290;
var contentLeft = (viewPortWidth / 2) - 480
$('#content').css({
top: contentTop+'px',
left: contentLeft+'px'
});
}