var isNN = (navigator.appName.indexOf("Netscape",0) != -1)?true:false;

function DoImageOver(imgName, imgSrc)
{
   if (imgSrc == null)
      imgSrc = imgName;

   if (document.images)
      document.images[imgName].src = imgSrc + "On.gif";
}

function DoImageOut(imgName, imgSrc)
{
   if (imgSrc == null)
      imgSrc = imgName;

   if (document.images)
      document.images[imgName].src = imgSrc + "Off.gif";
}

function getRandomNumber(seed) 
{
	var randomNum=Math.floor(Math.random()*seed);
	return randomNum;
}

function getRandomHomepageImg(imgName, seed)
{
	var fullImgName = imgName + getRandomNumber(seed) + ".gif";
	document.images[imgName].src = fullImgName;
}

function changeScreenshotImg(imgName, seq, imgPath) 
{	
	document.images[imgName].src = imgPath + imgName + seq + ".gif";
}

function changeScreenshotSeqBg(seqId)
{
	var obj = document.getElementById(seqId);
	obj.style.backgroundColor = "#3D77A7";
	obj.style.color = "#FFFFFF";
}

function restoreScreenshotSeqBg(seqId)
{
	var obj = document.getElementById(seqId);
	obj.style.backgroundColor = "#FFFFFF";
	obj.style.color = "#3D77A7";
}