function setBg(id) {
	var element = document.getElementById(id);
	var strProperty = ("url(\/grf\/images\/banner_" + randomNumber(6) + ".jpg) no-repeat top right");
	element.style.background = strProperty;
	//alert(element.style.background);
}
function randomNumber(rangeMax) {
	var randomNumber = Math.floor(Math.random()*(rangeMax+1))
	return randomNumber;
}