function getOffsetTop(object) {
  var offset = 0;

  // calculate everything except for the body
  while(object && object.offsetParent) {
    if (object.offsetTop >= 0)
      offset = offset + object.offsetTop;
    if (object.offsetParent && object.clientTop >= 0)
      offset = offset + object.clientTop;

    object = object.offsetParent;
  }

  return offset;
}

function getOffsetLeft(object) {
  var offset = 0;

  // calculate everything except for the body
  while(object && object.offsetParent) {
    if (object.offsetLeft >= 0)
      offset = offset + object.offsetLeft;
    if (object.offsetParent && object.clientLeft >= 0)
      offset = offset + object.clientLeft;

    object = object.offsetParent;
  }

  return offset;
}

function turnOnDayHover(divtag, hoverdiv) {
  var divTop = 0;
  var divLeft = 0;

  divTop = getOffsetTop(divtag);
  divLeft = getOffsetLeft(divtag);

  hoverdiv.style.visibility = 'visible';
  hoverdiv.style.width = divtag.offsetWidth;
  if (divtag.currentStyle) {
    hoverdiv.style.backgroundColor = divtag.currentStyle.backgroundColor;
  }

  hoverdiv.style.left = (divLeft + (document.all ? -2 : -1)) + 'px';
  hoverdiv.style.top = (divTop + (document.all ? -2 : -1)) + 'px';

  hoverdiv.innerHTML = divtag.innerHTML;
  hoverdiv.style.width = (divtag.offsetWidth + (document.all ? 2 : 0)) + 'px';

  hoverdiv.style.height = 'auto';
  if (divtag.offsetHeight > hoverdiv.offsetHeight) {
    hoverdiv.style.height = (divtag.offsetHeight + 2) + 'px';
  }
}


function turnOffDayHoverEvent(e) {
  if (!e) e = window.event;
  divtag = (e.srcElement ? e.srcElement : e.target);
  hoverdiv = document.getElementById('expandedDay');

  turnOffDayHover(divtag, hoverdiv, e);
}

function turnOffDayHover(divtag, hoverdiv, e) {
  var width = 0;
  var height = 0;
  if (divtag && divtag.offsetWidth > hoverdiv.offsetWidth) {
     width = divtag.offsetWidth;
  }
  else {
     width = hoverdiv.offsetWidth;
  }
  if (divtag && divtag.offsetHeight > hoverdiv.offsetHeight) {
     height = divtag.offsetHeight;
  }
  else {
     height = hoverdiv.offsetHeight;
  }

  var divTop = getOffsetTop(hoverdiv);
  var divLeft = getOffsetLeft(hoverdiv);
  var divBottom = divTop + height;
  var divRight = divLeft + width;

  var mouseX = e.clientX + (window.scrollX ? window.scrollX : document.body.scrollLeft);
  var mouseY = e.clientY + (window.scrollY ? window.scrollY : document.body.scrollTop);

  if (divLeft > mouseX-2 || divRight < mouseX+1 || divTop > mouseY-2 || divBottom < mouseY+2) {
     hoverdiv.style.visibility = 'hidden';
  }
}

function turnOffHoverOnResizeEvent(e) {
  if (!e) e = window.event;
  document.getElementById('expandedDay').style.visibility = 'hidden';
}

if (!document.all) {
  HTMLElement.prototype.__defineGetter__('currentStyle', function() {
  return document.defaultView.getComputedStyle(this, null);
  });
  CSSStyleDeclaration.prototype=function() {
  for (i=0;i<this.length;i++) {
    var prop=this.item(i);
    this[prop]=this.getPropertyValue(prop);
  }
  }
  CSSStyleSheet.prototype.__defineGetter__('rules', function() {
  return this.cssRules;
  });
}