function set_opacity(elem, value) {
	var style=elem.style;
	style.opacity = value; 
	style.MozOpacity = value; 
	style.KhtmlOpacity = value; 
	style.filter = "alpha(opacity=" + value*100 + ")"; 	
}
function increase_opacity(id, from, to, step, delay) {
	var elem=document.getElementById(id);
	if(from+step <= to) {
		set_opacity(elem, from+step);
	} else {
		set_opacity(elem, to);
	}
	from+=step;
	setTimeout("increase_opacity('"+id+"', "+from+", "+to+", "+step+", "+delay+")", delay);
}