function getHeight() {
    var headerheigth = 120;
          var myWidth = 0, myHeight = 0;
          if( typeof( window.innerWidth ) == 'number' ) {
            //Non-IE
            myWidth = window.innerWidth;
            myHeight = window.innerHeight;
          } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
            //IE 6+ in 'standards compliant mode'
            myWidth = document.documentElement.clientWidth;
            myHeight = document.documentElement.clientHeight;
          } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
            //IE 4 compatible
            myWidth = document.body.clientWidth;
            myHeight = document.body.clientHeight;
          }
    myHeight = myHeight - headerheigth;
    return myHeight;
}

function setGround() {
   if (document.getElementById) {
          var groundheight = getHeight();
          groundheight=groundheight-120;
          if (groundheight > 0) {
                var groundElement1 = document.getElementById('contentcenter');
                groundElement1.style.minHeight =groundheight +  'px';
            }
      }
}

//window.onload = setGround();
window.resize = setGround();