/**
 * @author nicola
 */
function loadingOn() {
	loader = document.getElementById('loading-img');
	setOpacity(loader,90);
	loader.style.display = 'block';
}

function setOpacity(obj,opacity){
	opacity=(opacity==100) ? 99.999 : opacity;
	// IE/Win
	obj.style.filter = "alpha(opacity:"+opacity+")";
	// Safari<1.2, Konqueror
	obj.style.KHTMLOpacity = opacity/100;
	// Older Mozilla and Firefox
	obj.style.MozOpacity = opacity/100;
	// Safari 1.2, newer Firefox and Mozilla, CSS3
	obj.style.opacity = opacity/100;
}