How to simple imageblend with javasdcript07.12.13

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 hideimages(){

document.getElementById('img1').style.opacity = 0;
    document.getElementById('img2').style.opacity = 0;
    document.getElementById('img3').style.opacity = 0;
    document.getElementById('img4').style.opacity = 0;
    document.getElementById('img5').style.opacity = 0;
    document.getElementById('img6').style.opacity = 0;
    showimages();
    timedCount();
}

function showimages(){
    document.getElementById('img1').style.visibility = "visible";
    document.getElementById('img2').style.visibility = "visible";
    document.getElementById('img3').style.visibility = "visible";
    document.getElementById('img4').style.visibility = "visible";
    document.getElementById('img5').style.visibility = "visible";
    document.getElementById('img6').style.visibility = "visible";
}

var c=0;
var t;

function timedCount()
{
  c=c+1;
  t=setTimeout("timedCount()",1000);
  if (c==5){ shiftOpacity('img1', 1000) }
  if (c==10){ shiftOpacity('img1', 1000) }

if (c==10){ shiftOpacity('img2', 1000) }
  if (c==15){ shiftOpacity('img2', 1000) }

if (c==15){ shiftOpacity('img3', 1000) }
  if (c==20){ shiftOpacity('img3', 1000) }

if (c==20){ shiftOpacity('img4', 1000) }
  if (c==25){ shiftOpacity('img4', 1000) }

if (c==25){ shiftOpacity('img5', 1000) }
  if (c==30){ shiftOpacity('img5', 1000) }

if (c==30){ shiftOpacity('img6', 1000) }
  if (c==35){ shiftOpacity('img6', 1000) }
}

Anonymous