function operate(){
if (om == 0){
	menuShow();
}
else {
	menuHide();
}
}
function menuShow(){
	om = 1;
	document.getElementById("menu").style.visibility = "visible";
	document.getElementById("menu").style.height = "300px";
	opacity('menu', 0, 100, 350);
}

function menuHide(){
	om = 0;
	opacity('menu', 100, 0, 350);
}

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 + ")";
	setTimeout("shrink()",500);
}
function shrink(){
if (om == 0){
document.getElementById("menu").style.visibility = "hidden";
document.getElementById("menu").style.height = "0px";
}
else {}
}