var menus_loaded;
menus_loaded = false;

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) {
	document.getElementById(id).style.filter = "alpha(opacity=" + opacity + ")";
	document.getElementById(id).style.MozOpacity = (opacity / 100);
	document.getElementById(id).style.opacity = (opacity / 100);
}

function shiftOpacity(id,millisec) {

	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;

	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	changeOpac(0,imageid);
	document.getElementById(imageid).src = imagefile;

	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}