uses CSS transparency, in CSS you can set the transparency in different ways. To ensure t
ee.
This one is the official CSS3 method, at the moment it works in newer Mozilla versions.
There is actually another one: -khtml-opacity: 0.5; works for the browsers Konquerer on Linux and Safari on MacOS. You could add it too if you want to support these users. Somewhere in the near
most browsers will support CSS3 and opacity: 0.5; should work everywhere.
function opacity(id, opacStart, opacEnd, millisec) {
//speed for
each frame
VAR speed = Math.round(millisec / 100);
var timer = 0;
//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) {
for(i = opacStart; i <= opacEnd;
i++)
{
setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
timer++;
}
}
}
//change the opacity for different browsers
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 an element is invisible, make it visible, else make it ivisible
if(document.getElementById(id).style.opacity
== 0) {
opacity(id, 0, 100, millisec);
} else {
opacity(id, 100, 0, millisec);
}
}
function blendimage(divid, imag
eid, imagefile, millisec) {
var speed = Math.round(millisec / 100);
var timer = 0;
//set the
current image as background
document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
//make image transparent
changeOpac(0, imageid);
//make new image
document.getElementById(imageid).src = imagefile;
//fade in image
for(i = 0; i <= 100; i++) {
setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
timer++;
}
}
function currentOpac(id, opacEnd, millisec) {
//standard opacity is 100
var currentOpac = 100;
//if the element has an opacity set, get it
if(document.getElementById(id).style.opacity < 100) {
currentOpac = document.getElementById(id).style.opacity * 100;
}
//call for the function that changes the opacity
opacity(id, currentOpac, opacEnd, millisec)
}