function newWinSize() {
    var divX = $('.div_slideshow').width()
    var divY = 626

    var imgX = $('.img_side_show').width()
    var imgY = $('.img_side_show').height()


    //var faktor = imgY / imgX
    var faktor = 0.4890625
    var newImgX = divX
    var newImgY = parseInt(newImgX * faktor)
    if (newImgY < divY) {
        newImgY = divY
        newImgX = parseInt(divY / faktor)
    }
    //alert(newImgY)

    $('.img_side_show').width(newImgX)
    $('.img_side_show').height(newImgY)
}

$(window).resize(function () {
    newWinSize();
});

 $(document).ready(function() {
    newWinSize()
})