var timerlen = 5;
var slideAniLen = 200;

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 currTId = null;
var currDId = null;
var currTag0 = null;

function slidedown(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(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);

		if(dir[objname] == "down"){
			obj[objname].style.height = "1px";
		}

		obj[objname].style.display = "block";
		startTime[objname] = (new Date()).getTime();
		//endHeight[objname] = obj[objname].scrollHeight;
		endHeight[objname] = 333;

		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";
        }

        return;
}

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

        if(dir[objname] == "up")
                obj[objname].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, number){
  if(document.getElementById(objname + "_" + number).style.display == "none"){
    // div is hidden, so let's slide down
	for(var i=1; i<totalItem+1; i++) {
		if(i == number) {
    		slidedown(objname + "_" + i);
		} else {
			slideup(objname + "_" + i);
		}
	}
  }else{
    // div is not hidden, so slide up
    //slideup(objname + "_" + number);
  }
}

function singleLink_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 changeBookDisplay(obj,tag,id) {
	if(currTId!=null)
	{
		if(currTag!=null) {
			if(returnElement(currTId)) returnElement(currTId).style.display="block";
			if(returnElement(currDId)) returnElement(currDId).style.display="none";
			
			if(currTag!=tag) {
				if(returnElement(currTId)) returnElement(currTId).style.display="block";
				if(returnElement(currDId)) returnElement(currDId).style.display="none";
				var currTIdReset = currTag + "1";
				var currDIdReset = currTag + "_Over1";
				if(returnElement(currTIdReset)) returnElement(currTIdReset).style.display="none";
				if(returnElement(currDIdReset)) returnElement(currDIdReset).style.display="block";
			}
		}
	}

	var Tid = tag + id;
	var Did = tag + "_Over" + id;

	if(returnElement(Tid)) returnElement(Tid).style.display="none";
	if(returnElement(Did)) returnElement(Did).style.display="block";

	currTag = tag;
	currTId = Tid;
	currDId = Did;
}