var timerlen 			= 5;

var slideHeight 		= 0;
var scrollByPixel		= 10;
var scrollByPixelNow 	= scrollByPixel;
var heightSlow 			= 50;
var pixel 				= 0;

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

function slidedown(objname){
	pixel = 0;
	if(moving[objname]){
		return;
	}
	if(document.getElementById(objname).style.display != "none"){
		return;
	}
	moving[objname] = true;
	dir[objname] = "down";
	startslide(objname);
}
function slideup(objname){
	pixel = slideHeight;
	if(moving[objname]){
		return;
	}
	if(document.getElementById(objname).style.display == "none"){
		return;
	}
	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 = "1px";
	}
	obj[objname].style.display = "block";		
	timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}
function slidetick(objname){
	var stop_slide = false;
	if(dir[objname] == "up"){
		if(pixel <= 0){
			var stop_slide = true;
		}
	} else {
		if(pixel >= slideHeight){
			var stop_slide = true;
		}
	}	
	if(stop_slide){
		endSlide(objname);
		scrollByPixelNow = scrollByPixel;
	} else {
		var objHeight = obj[objname].style.height.replace('px','');
		if(dir[objname] == "up"){
			if(objHeight <= heightSlow){
				if(scrollByPixelNow > 1){
					var procentHeight = (100/heightSlow)*objHeight;
					scrollByPixelNow = (scrollByPixel/100)*procentHeight;
				} else {
					scrollByPixelNow = 1;
				}
			}
		} else {
			if(objHeight > (slideHeight-heightSlow)){
				if(scrollByPixelNow > 1){
					var procentHeight = (100/heightSlow)*(slideHeight-objHeight);
					scrollByPixelNow = (scrollByPixel/100)*procentHeight;
				} else {
					scrollByPixelNow = 1;
				}
			}
		}
		if(dir[objname] == "up"){
			pixel -= scrollByPixelNow;
		} else {
			pixel += scrollByPixelNow;
		}
		obj[objname].style.height = pixel + "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,slideHeightSet){
	slideHeight 		= slideHeightSet;
	scrollByPixel		= (slideHeight/100)*5;
	scrollByPixelNow 	= scrollByPixel;
	heightSlow			= (slideHeight/100)*30;

	if(document.getElementById(objname).style.display == "none"){
		slidedown(objname);
	} else {
		slideup(objname);
	}
}