function evenHeight(divID1, divID2){
    var div1 = document.getElementById(divID1);
    var div2 = document.getElementById(divID2);
    var heighest = div1.offsetHeight > div2.offsetHeight ? div1 : div2;
    div1.style.height = heighest.offsetHeight -10 + "px";
    div2.style.height = heighest.offsetHeight -20 + "px";
}