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, imageid, 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) 
}