function on(event)
{
  var elem = (!event.target) ? window.event.srcElement : event.target;
  while (elem.nodeName != "TD")
    elem = elem.parentNode;
  elem.style.background = "#efefef";
  elem.style.border = "1px solid #ccc";
}

function off(event)
{
  var elem = (!event.target) ? window.event.srcElement : event.target;
  while (elem.nodeName != "TD")
    elem = elem.parentNode;
  elem.style.background = "none";
  elem.style.border = "1px solid #f8f8f8";
}


//*****************************************************************************
// Code below is used for repositioning homelettes
//
// Portions are Copyright 2001 by Mike Hall
// See http://www.brainjar.com for terms of use
//*****************************************************************************

// Determine browser and version.

function Browser() {

  var ua, s, i;

  this.isIE    = false;
  this.isNS    = false;
  this.version = null;

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  // Treat any other "Gecko" browser as NS 6.1.

  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;
  }
}

var browser = new Browser();

// Global object to hold drag information.

var dragObj = new Object();

function dragStart(event, id) 
{

  var el;
  var x, y;

  // If an element id was given, find it. Otherwise use the element being
  // clicked on.

  if (id)
    dragObj.elNode = document.getElementById(id);
  else {
    if (browser.isIE)
      dragObj.elNode = window.event.srcElement;
    if (browser.isNS)
      dragObj.elNode = event.target;

    // If this is a text node, use its parent element.

    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;
  }

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Save starting positions of cursor and element.

  dragObj.cursorStartX = x;
  dragObj.cursorStartY = y;
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);

  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0;

  // Update element's z-index.

  dragObj.elNode.style.zIndex = 5;

  // Capture mousemove and mouseup events on the page.

  if (browser.isIE) {
    document.attachEvent("onmousemove", dragGo);
    document.attachEvent("onmouseup",   dragStop);
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS) {
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    event.preventDefault();
  }
}

function dragGo(event) 
{
  var x, y;

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Move drag element by the same amount the cursor has moved.

  dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
  dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px";

  if (browser.isIE) {
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS)
    event.preventDefault();
}

var homeletContainers = [];
var homelets = [];

function addHomeletContainer(dropTarget)
{
	homeletContainers.push(dropTarget);
}

function addHomelet(dropTarget)
{
	homelets.push(dropTarget);
}

function dragStop(event) 
{
	var mousePos = mouseCoords(event || window.event);
  var dropSuccess = false;
  var x, y;
  
  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }
  
  // did we actually move it?
  if(Math.abs(dragObj.cursorStartX-x)<20 && Math.abs(dragObj.cursorStartY-y)<20)
  {
		dropSuccess = true;
	} else {
  
	  // first see if we have dropped this on a homelet
		for(var i=0; i<homelets.length; i++)
		{
			var curTarget  = homelets[i];
			var targPos    = getPosition(curTarget);
			var targWidth  = parseInt(curTarget.offsetWidth);
			var targHeight = parseInt(curTarget.offsetHeight);
	
			if(curTarget.id != dragObj.elNode.id      &&
				(mousePos.x > targPos.x)                &&
				(mousePos.x < (targPos.x + targWidth))  &&
				(mousePos.y > targPos.y)                &&
				(mousePos.y < (targPos.y + targHeight)))
			{
				dropSuccess = true;
				curTarget.parentNode.insertBefore(dragObj.elNode, curTarget);
			}
		}
	
	  // then see if we have dropped this on a homelet container
	  if(!dropSuccess)
	  {
			for(var i=0; i<homeletContainers.length; i++)
			{
				var curTarget  = homeletContainers[i];
				var targPos    = getPosition(curTarget);
				var targWidth  = parseInt(curTarget.offsetWidth);
				var targHeight = parseInt(curTarget.offsetHeight);
		
				if(
					(mousePos.x > targPos.x)                &&
					(mousePos.x < (targPos.x + targWidth))  &&
					(mousePos.y > targPos.y)                &&
					(mousePos.y < (targPos.y + targHeight)))
				{
					dropSuccess = true;
					curTarget.appendChild(dragObj.elNode);
				}
			}
		}
	}
	
	dragObj.elNode.style.left='0px';
	dragObj.elNode.style.top='0px';			
  dragObj.elNode.style.zIndex = 0;

	dragObj.elNode = null;
  // Stop capturing mousemove and mouseup events.
  if (browser.isIE) {
    document.detachEvent("onmousemove", dragGo);
    document.detachEvent("onmouseup",   dragStop);
  }
  if (browser.isNS) {
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
  }
  
  // save for next time
  savePreferences();
}

function mouseCoords(event)
{
	if(event.pageX || event.pageY){
		return {x:event.pageX, y:event.pageY};
	}
	return {
		x:event.clientX + document.body.scrollLeft - document.body.clientLeft,
		y:event.clientY + document.body.scrollTop  - document.body.clientTop
	};
}

function getPosition(e)
{
	var left = 0;
	var top  = 0;
	while (e.offsetParent){
		left += e.offsetLeft;
		top  += e.offsetTop;
		e     = e.offsetParent;
	}
	left += e.offsetLeft;
	top  += e.offsetTop;
	return {x:left, y:top};
}

function toggleDisplay(id)
{
	var elem = document.getElementById(id);
	if(elem.style.display!="") 
	{
		elem.style.display="";
	} else {
		elem.style.display="none";
	}
}

function loadPreferences()
{
	var prefs = getCookie('homelets');
	if(prefs!=null)
	{
		prefs = prefs.split("|");
		var columnIndex=0;
		for(var i=0; i<prefs.length-1; i++)
		{
			if(prefs[i]=='_')
			{
				columnIndex++;
			} else {
				var column = document.getElementById("contentColumn"+columnIndex);
				if(column!=null)
				{
					var homelet = document.getElementById(prefs[i]);
					if(homelet!=null)
						column.appendChild(homelet);
				}
			}			
		}
	}
}

function removeHomelet(hom)
{
	var homelet = document.getElementById(hom);
	if(homelet!=null)
		homelet.parentNode.removeChild(homelet);
	savePreferences();
}

function savePreferences()
{
	var storage="";
	for(var i=0; i<homeletContainers.length; i++)
	{
		childNodes = homeletContainers[i].childNodes;
		for(var k=0; k<childNodes.length; k++)
			if(childNodes[k].className=='homelet')
				storage+=childNodes[k].id+"|";
		if(i+1<homeletContainers.length)
			storage+="_|";
	}

	var now = new Date();
  now.setTime(now.getTime() + 365 * 24 * 60 * 60 * 1000);
  setCookie('homelets',storage,now);
}