function changeDivImage()
{
	var imgPath = new String();
	var myFile = "url(http://www.xerenet.com/templates/ja_purity/images/header/myheaders/"+myHeader+")";
	imgPath = document.getElementById("ja-header").style.backgroundImage;
	
	if(imgPath != myFile || imgPath == "")
	{
		document.getElementById("ja-header").style.backgroundImage = myFile;
	}
}
changeDivImage();