var imagePath_tmp;

function setBackground(imagePath)
{
	if(imagePath=="") return;

	var imgPreload = new ImagePreloader("",onLoaded);

	imagePath_tmp = imagePath;

	imgPreload.preload(imagePath);

}

function onLoaded()
{
	$('wrapper').style.background = 'url(' + imagePath_tmp + ') no-repeat';
}