// JavaScript Document
var timerlen = 40;
var slideAniLen = 400;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endWidth = new Array();
var moving = new Array();
var dir = new Array();

function slideOver(objname){
	if(moving[objname])
		return;
	if(document.getElementById(objname).style.display != "none")
		return;
	moving[objname] = true;
	dir[objname] = "over";
	startSlide(objname);
}

function slideBack(objname){
	if(moving[objname])
    	return;
 	if(document.getElementById(objname).style.display == "none")
    	return; 
 
  	moving[objname] = true;
  	dir[objname] = "back";
  	startSlide(objname);	
}

function startSlide(objname){
	obj[objname] = document.getElementById(objname);
	
	endWidth[objname] = parseInt(obj[objname].style.width);
	startTime[objname] = (new Date()).getTime();
	
	if(dir[objname] == "over"){
		obj[objname].style.width = "1px";	
	}
	
	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 * endWidth[objname]);
		if(dir[objname] == "back")
			d = endWidth[objname] - d;
		
		obj[objname].style.width = d + "px";
	}
	
	return;
}

function endSlide(objname){
	clearInterval(timerID[objname]);
	
	if(dir[objname] == "back")
		obj[objname].style.display = "none";
		
	obj[objname].style.width = endWidth[objname] + "px";
	
	delete(moving[objname]);
  	delete(timerID[objname]);
  	delete(startTime[objname]);
  	delete(endWidth[objname]);
  	delete(obj[objname]);
 	delete(dir[objname]);
 
  	return;
}