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++;
	if(i == opacEnd){
		document.getElementById(id).style.display= 'none';
	}}
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
		if(i == opacStart){
		document.getElementById(id).style.display = 'block';
        }}
    }
}


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) {
k= ["","1","2","3","4","5","6","7","8","9","10","11","12","13","15","16","17"];
for(z=1; z<4; z++){
var ki = "munkatars"+k[z];
if(document.getElementById(ki).style.opacity != 0) {
 opacity(ki, 100, 0, millisec);
    }
}
for(z=5; z<15; z++){
var ki = "munkatars"+k[z];
if(document.getElementById(ki).style.opacity != 0) {
 opacity(ki, 100, 0, millisec);
    }
}
        opacity(id, 0, 100, millisec);
    } else {
        opacity(id, 100, 0, millisec);
    }
}