function opacity(id, opacStart, opacEnd, millisec) {

    var speed = Math.round(millisec / 100);
    var timer = 0;

    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++;
        }
    }
}

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 + ")";
	
}