var init = function () {
    // upravi velikosti hlavnich divu tak, aby byly vzdy az na zacatek paticky
    
    // hlavni divy
    var leftContentElm = document.getElementById("leftContentMain");
    var centerContentElm = document.getElementById("centerContent");
    var rightContentElm = document.getElementById("rightContent");
    
    // jejich velikosti
    var leftContentElmHeight = leftContentElm.offsetHeight;
    var centerContentElmHeight = centerContentElm.offsetHeight;
    var rightContentElmHeight = rightContentElm.offsetHeight;
    
    // porovname tri vysky a vybereme nejvetsi hodnotu
    var max_1 = Math.max(leftContentElmHeight,centerContentElmHeight);
    var max_2 = Math.max(centerContentElmHeight,rightContentElmHeight);
    var maxHeight = Math.max(max_1,max_2);
    
    // prirazeni nove vysky
    leftContentElm.style.height = maxHeight+"px";
    centerContentElm.style.height = maxHeight+"px";
    rightContentElm.style.height = maxHeight+"px";
}

window.onload = init;