// JavaScript Document

var elements = new Array();

function getAllElements() {
	var all = document.all ? document.all : document.getElementsByTagName('div');
	for (var e=0; e<all.length; e++) {
		if (all[e].id.indexOf('popup')>=0) {
			elements[elements.length] = all[e];
		}
	}
}

function fade(id) {
	var object = document.getElementById(id);
	
	for (var i=0; i<elements.length; i++) {
		if (id!=elements[i].id && elements[i].shown) {
			elements[i].shown=false;
			opacity(elements[i].id, 97, 0, 200);
		}
	}
	
	if (object.shown) {
		object.shown=false;
	  opacity(id, 97, 0, 200);
	} else {
		object.shown=true;
		opacity(id, 0, 97, 200);
	}
}

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;
		(opacity==0) ? object.display="none" : object.display="block";
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}