function adjustFrame() {

    var alturaTela;
    var larguraTela;
    var viewportwidth;
    var viewportheight;
    var mContent = document.getElementById("mContent");
    var white = document.getElementById("white");

    if (screen) {
        alturaTela = screen.height;
        larguraTela = screen.width;
    }
    if (typeof window.innerWidth != 'undefined') {
        viewportwidth = window.innerWidth,
        viewportheight = window.innerHeight
    } else if (typeof document.documentElement != 'undefined' && typeof document.documentElement.clientWidth != 'undefined' && document.documentElement.clientWidth != 0) {
        viewportwidth = document.documentElement.clientWidth,
        viewportheight = document.documentElement.clientHeight
    } else {
        viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
        viewportheight = document.getElementsByTagName('body')[0].clientHeight
    }

    if (document.getElementById("mContent")) {
        white.style.height = (mContent.offsetHeight - 310) + "px";
    }
}

window.onload = adjustFrame;