var timerlen = 5;
var slideAniLen = 250;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();
var currentObjName = "";
var checkObjName = "";

function slidedown(objname){
        //if (objname=='leftNav') { alert('DOWN'); }
        currentObjName = objname;
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display != "none")
                return; // cannot slide down something that is already visible

        moving[objname] = true;
        dir[objname] = "down";
        startslide(objname);
}

function slideup(objname){
        //if (objname=='leftNav') { alert('UP'); } 
        currentObjName = objname;
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display == "none")
                return; // cannot slide up something that is already hidden

        moving[objname] = true;
        dir[objname] = "up";
        startslide(objname);
}

function startslide(objname){
        obj[objname] = document.getElementById(objname);

        endHeight[objname] = parseInt(obj[objname].style.height);
        startTime[objname] = (new Date()).getTime();

        if(dir[objname] == "down"){
                obj[objname].style.height = "0px";
        }

        obj[objname].style.display = "block";

        timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname){
        var elapsed = (new Date()).getTime() - startTime[objname];

        if (elapsed > slideAniLen)
                endSlide(objname)
        else {
                var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
                if(dir[objname] == "up")
                        d = endHeight[objname] - d;

                obj[objname].style.height = d + "px";
                if(objname=='leftNav') {
                    resizeLeftNavIFrame();
                }
        }

        return;
}

function endSlide(objname){
        clearInterval(timerID[objname]);

        if(dir[objname] == "up") {
            obj[objname].style.display = "none";
            if (objname=='leftNav') {
                document.getElementById('leftNavIFrame').style.display = 'none';
            }
        }
        
        obj[objname].style.height = endHeight[objname] + "px";

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endHeight[objname]);
        delete(obj[objname]);
        delete(dir[objname]);

        return;
}


function toggleSlide(objname){
	if(document.getElementById(objname).style.display == "none"){
		// div is hidden, so let's slide down
		slidedown(objname);
	}else{
		// div is not hidden, so slide up
		slideup(objname);
	}
}

function delaySlide(objname) {
    currentObjName = "";
    checkObjName = objname;
    var t = setTimeout("checkSlide()",500);
    
}

function saveSlide(objname) {
    currentObjName = objname;
}

function checkSlide(objname) {
    if (checkObjName != currentObjName) {
        slideup(checkObjName);
    }
}

function resizeLeftNavIFrame() {
    // show layer
    var layer = document.getElementById('leftNav');
    //layer.style.display = 'block';
    // show IFRAME
    var iframe = document.getElementById('leftNavIFrame');
    iframe.style.display = 'block';
    iframe.style.height = layer.offsetHeight;
    iframe.style.width = layer.offsetWidth;
    iframe.style.left = layer.offsetLeft;
    iframe.style.top = layer.offsetTop;
}

function minimizeLeftNavIFrame() {
    document.getElementById('leftNavIFrame').style.height = '1px';
}