function demand(obj)
{
	reSetNode("ddrinkery");
	reSetNode("dhotel");
	reSetNode("dproduct");
	reSetNode("dticket");
	document.getElementById(obj).style.cssText="background-color:#FFF;";
	document.getElementById(obj+"bg").style.display="block"; 
}
function reSetNode(id){
	document.getElementById(id).style.cssText="background:none;";
	document.getElementById(id+"bg").style.display="none";
}