var theWidth;
var theHeight;


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

$(window).ready(function () {
    sizeContent();
});

function sizeContent() {
    theWidth = $(window).width();
    theHeight = $(window).height();

    if (theHeight <= 800 ){
        $(".contentItem").css('height', 800);
    } else if( theHeight > 800){
        $(".contentItem").css('height', theHeight);
    }
}