Prova questo, ma prima controllalo:
codice:
function opacity(id, opacStart, opacEnd, millisec) {
//speed for each frame
var speed = Math.round(millisec / 100);
var timer = 0;
var self = this;
//determine the direction for the blending, if start and end are the same nothing happens
if(opacStart > opacEnd) {
for(i = opacStart; i >= opacEnd; i--) {
setTimeout("changeOpac("+i+",'"+id+"')",(timer * speed));
timer++;
}
} else if(opacStart < opacEnd) {
document.getElementById(id).style.display='block';
for(i = opacStart; i <= opacEnd; i++)
{
setTimeout("changeOpac("+i+",'"+id+"')",(timer * speed));
timer++;
}
}
};
function changeOpac(opacity, id) {
var object = document.getElementById(id).style;
object.opacity = (opacity / 100);
object.MozOpacity = (opacity / 100);
object.KhtmlOpacity = (opacity / 100);
object.filter = "alpha(opacity=" + opacity + ")";
};