// divID - ID of some div
// divBackground - url of the loading image
// imgDefault - url of the default image
function picBack(divID, divBackground, imgDefault) { 
	var d=document.getElementById(divID);
	if(divBackground=="" || d==null) {noBG(divID); return;}
	var img = new Image();
	d.style.backgroundImage = 'url(' + imgDefault + ')';
	img.onload = function() {  d.style.backgroundImage = 'url(' + img.src + ')'; };
	img.src = divBackground;
}