if (document.images)
{
	var portfolio0 = new Image();
	portfolio0.src = "images/imgNavPortfolioOff.gif";
	var portfolio1 = new Image();
	portfolio1.src = "images/imgNavPortfolioOn.gif";
	var about0 = new Image();
	about0.src  = "images/imgNavAboutOff.gif";
	var about1 = new Image();
	about1.src  = "images/imgNavAboutOn.gif";
	var contact0 = new Image();
	contact0.src = "images/imgNavContactOff.gif";
	var contact1 = new Image();
	contact1.src = "images/imgNavContactOn.gif";
	
	var portfolio20 = new Image();
	portfolio20.src = "images/imgNavPortfolioOff.gif";
	var portfolio21 = new Image();
	portfolio21.src = "images/imgNavPortfolioOn.gif";
	var about20 = new Image();
	about20.src  = "images/imgNavAboutOff.gif";
	var about21 = new Image();
	about21.src  = "images/imgNavAboutOn.gif";
	var contact20 = new Image();
	contact20.src = "images/imgNavContactOff.gif";
	var contact21 = new Image();
	contact21.src = "images/imgNavContactOn.gif";
}

function rollOut(imgName) 
{
    if (document.images) 
    {
        document[imgName].src = eval(imgName+"0.src");
    }
}

function rollIn(imgName)
{
    if (document.images)
    {
        document[imgName].src = eval(imgName+"1.src");
    }
}

function changeGallery(imgName)
{
	if (document.images)
  {
  	document.images['main'].src = eval(imgName+".src");
  }
}