var currImage = 2;
var maxImage = 4;

function changeImage(imgNum){
	if(imgNum == null)
	{
		imgNum = currImage;
	}
	else{
		currImage = imgNum;
	}
	var imgPath = '/images/ProductCatalogs/79156/cms_assets/image/imgSliderBig' + imgNum + '.jpg';
	
	$("#imageholder").animate({
		opacity: 0.5}, 1000, function(){
		$("#imageholder").css("background","url('" + imgPath + "') no-repeat")
	});
	$("#imageholder").animate({opacity: 1.0}, 1000,null);
	
	currImage++;
	if(currImage > maxImage)
	{
		currImage = 1;
	}
}