function opacity(id, opacStart, opacEnd, millisec) {
var step = 5;
var speed = Math.round(millisec / (100 / step));
var timer = 0;
if(opacStart > opacEnd) {
for(i = opacStart; i >= opacEnd; i -= step) {
setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
timer++;
}
} else if(opacStart < opacEnd) {
for(i = opacStart; i <= opacEnd; i += step)
{
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 + ")";
}
function shiftOpacity(id, millisec) {
if(document.getElementById(id).style.opacity == 0) {
opacity(id, 0, 100, millisec);
} else {
opacity(id, 100, 0, millisec);
}
}
function blendimage(divid, imageid, imagefile, millisec) {
var speed = Math.round(millisec / 100);
var timer = 0;
document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
changeOpac(0, imageid);
document.getElementById(imageid).src = imagefile;
for(i = 0; i <= 100; i++) {
setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
timer++;
}
}
function currentOpac(id, opacEnd, millisec) {
var currentOpac = 100;
if(document.getElementById(id).style.opacity < 100) {
currentOpac = document.getElementById(id).style.opacity * 100;
}
opacity(id, currentOpac, opacEnd, millisec)
}