window.onload = function() {
    var iHeightLeftarea = document.getElementById("leftarea").offsetHeight;
    var iHeightRightbanner = document.getElementById("rightbanner").offsetHeight;
    var iHeightLogo = document.getElementById("logo").offsetHeight;
    var iHeightNavi = document.getElementById("navi").offsetHeight;
    var iHeightContent = document.getElementById("content").offsetHeight;
    var iHeightFooter = document.getElementById("footer").offsetHeight;
    var iTotalHeight = iHeightLogo + iHeightNavi + iHeightContent + iHeightFooter;
    var iAltContentHeight = iHeightLeftarea - (iHeightLogo + iHeightNavi + iHeightFooter + 20);

    if (iTotalHeight > iHeightLeftarea) {
        document.getElementById("leftarea").style.height = iTotalHeight + "px";
    }
    else {
        if (iTotalHeight < iHeightLeftarea) {
            document.getElementById("content").style.height = iAltContentHeight + "px";
        }
    }

    if (iTotalHeight > iHeightRightbanner) {
        document.getElementById("rightbanner").style.height = iTotalHeight + "px";
    }
}