resizeParams = {container:"#background div.active", image: "#background div img", minWidth: 968, minHeight: 623};

function resize_background(params)
{
    var minWidth  = params.minWidth;
    var minHeight = params.minHeight;

    $(params.image).css("width", "");
    $(params.image).css("height", "");

    var pageWidth  = $(window).width();
    var pageHeight = $(window).height();

    if(pageWidth < minWidth)
    {
        pageWidth = minWidth;
    }

    if(pageHeight < minHeight)
    {
        pageHeight = minHeight;
    }

    var w1 = 1600;
    var h1 = 1000;

    var w2 = pageWidth;
    var h2 = Math.floor(w2 * h1 / w1);

    $(params.image).css("width", w2 + "px");
    $(params.image).css("height", h2 + "px");

    if (h2 < pageHeight)
    {
        h2 = pageHeight;
        $(params.image).css("height", h2 + "px");

        w2 = w1 * h2 / h1;
        $(params.image).css("width", w2 + "px");
    };
}

$(document).ready(function()
{
    resize_background(resizeParams);

    $(window).resize(function()
    {
        resize_background(resizeParams);
    });
});