// Home Page Ad rotation
// smoothly transition between ads and allow the viewer to click on an ad to access
// its full article.

// Browser Slide-Show script. With image cross fade effect for those browsers
// that support it.
// Script copyright (C) 2004-2008 www.cryer.co.uk.
// Script is free to use provided this copyright header is included.
var FadeDurationMS=1000;
var thisImage_i = 0;
var numberofAds = 3;
var adurls=new Array();
adurls[0]="http://www.onebadant.com/index.php?iphoneapp=yes&appname=camonline";
adurls[1]="http://www.onebadant.com/index.php?iphoneapp=yes&appname=discoverytrail";
adurls[2]="http://www.onebadant.com/index.php?iphoneapp=yes&appname=thc14850";

function SetOpacity(object,opacityPct)
{
  // IE.
  object.style.filter = 'alpha(opacity=' + opacityPct + ')';
  // Old mozilla and firefox
  object.style.MozOpacity = opacityPct/100;
  // Everything else.
  object.style.opacity = opacityPct/100;
}

function ChangeOpacity(id,msDuration,msStart,fromO,toO)
{
  var element=document.getElementById(id);
  var msNow = (new Date()).getTime();
  var opacity = fromO + (toO - fromO) * (msNow - msStart) / msDuration;
  if (opacity>=100)
  {
    SetOpacity(element,100);
    element.timer = undefined;
  }
  else if (opacity<=0)
  {
    SetOpacity(element,0);
    element.timer = undefined;
  }
  else 
  {
    SetOpacity(element,opacity);
    element.timer = window.setTimeout("ChangeOpacity('" + id + "'," + msDuration + "," + msStart + "," + fromO + "," + toO + ")",10);
  }
}

function FadeInImage(foregroundID,newImage,backgroundID)
{
	var thisadurl = document.getElementById('adurl');
	
  var foreground=document.getElementById(foregroundID);
  if (foreground.timer) window.clearTimeout(foreground.timer);
  if (backgroundID)
  {
    var background=document.getElementById(backgroundID);
    if (background)
    {
      if (background.src)
      {
        foreground.src = background.src; 
        SetOpacity(foreground,100);
      }
      background.src = newImage;
      background.style.backgroundImage = 'url(' + newImage + ')';
      background.style.backgroundRepeat = 'no-repeat';
      var startMS = (new Date()).getTime();
      foreground.timer = window.setTimeout("ChangeOpacity('" + foregroundID + "'," + FadeDurationMS + "," + startMS + ",100,0)",10);
    }
  } else {
    foreground.src = newImage;
  }
  // once the ad is fully viewable, set the url
  thisadurl.href = adurls[thisImage_i];
}

var slideCache = new Array();
function RunSlideShow(pictureID,backgroundID,imageFiles,displaySecs)
{
	// reset array counter
	if (thisImage_i >= numberofAds)
	   {thisImage_i = 0;}
	
  var imageSeparator = imageFiles.indexOf(";");
  var nextImage = imageFiles.substring(0,imageSeparator);
  FadeInImage(pictureID,nextImage,backgroundID);
  var futureImages = imageFiles.substring(imageSeparator+1,imageFiles.length)+ ';' + nextImage;
  setTimeout("RunSlideShow('"+pictureID+"','"+backgroundID+"','"+futureImages+"',"+displaySecs+")",displaySecs*1000);
  // Cache the next image to improve performance.
  imageSeparator = futureImages.indexOf(";");
  nextImage = futureImages.substring(0,imageSeparator);

  if (slideCache[nextImage] == null)
  {
    slideCache[nextImage] = new Image;
    slideCache[nextImage].src = nextImage;
  }
  
	// increment array counter
	thisImage_i = thisImage_i + 1;
}

function loadadrotations()
{
    /* Update the ad space and call the rotator */
	thiselement = document.getElementById('homepageadslideshow');
	thiselement.innerHTML = "<a href='http://www.onebadant.com/index.php?iphoneapp=yes&appname=camonline' id='adurl' ><img src='images/stories/oba/homepgads/camonline_ad.gif' width='534' height='424' id='homepagead' border='0' /></a>";

	RunSlideShow("homepagead","homepageadslideshow", "images/stories/oba/homepgads/camonline_ad.gif;images/stories/oba/homepgads/discoverytrail_ad.gif;images/stories/oba/homepgads/thc14850_ad.gif",5);
}

function highlight_button()
{
	document.body.style.cursor = 'pointer';
	oba_changeDivClass("showmebutton","showmebutton_on","");
}

function de_highlight_button()
{
	document.body.style.cursor = 'default';
	oba_changeDivClass("showmebutton","showmebutton_off","");
}