// ---------- Motion Functions.

// ------------------------------------------------------------------------------------------------------------------------------------------------------------------ Common Variables.

var timerlen = 5;
var slideAniLen = 250;

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

// ------------------------------------------------------------------------------------------------------------------------------------------------------------------ Slide Functions.

function motion_slideDown(objname) {
	
	if (moving[objname]) {
		return;
	}

	if (document.getElementById(objname).style.display != "none") {
		return;
	}

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

function motion_slideUp(objname) {
	
	if (moving[objname]) {
		return;
	}

	if (document.getElementById(objname).style.display == "none") {
		return;
	}

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

function motion_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.overflow = "hidden";
	obj[objname].style.display = "block";
	
	timerID[objname] = setInterval('motion_slideTick(\'' + objname + '\');',timerlen);
	
}

function motion_slideTick(objname) {
	
	var elapsed = (new Date()).getTime() - startTime[objname];
	
	if (elapsed > slideAniLen) {
	
		motion_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 motion_endSlide(objname) {
	
	clearInterval(timerID[objname]);
	
	if (dir[objname] == "up") {
		obj[objname].style.display = "none";
		obj[objname].style.overflow = "hidden";
	}
	
	if (dir[objname] == "down") {
		obj[objname].style.overflow = "auto";
	}
	
	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;
	
}

// ------------------------------------------------------------------------------------------------------------------------------------------------------------------ Size Functions.

function motion_sizeUp(objname, current) {

	if (moving[objname]) {
		return;
	}

	if (document.getElementById(objname).style.display != "none") {
		return;
	}

	moving[objname] = true;
	dir[objname] = "up";
	motion_startSize(objname, current);
	
}

function motion_sizeDown(objname, current) {

	if (moving[objname]) {
		return;
	}

	if(document.getElementById(objname).style.display != "none") {
		return;
	}

	moving[objname] = true;
	dir[objname] = "down";
	motion_startSize(objname, current);
	
}

function motion_startSize(objname, current) {
	
	obj[objname] = document.getElementById(objname);
	
	startHeight[objname] = parseInt(document.getElementById(current).offsetHeight);
	
	document.getElementById(current).style.display = "none";
	
	obj[objname].style.visibility = "hidden";
	
	obj[objname].style.display = "block";
	
	endHeight[objname] = parseInt(obj[objname].offsetHeight);
	
	obj[objname].style.height = startHeight[objname] + 'px';
	
	startTime[objname] = (new Date()).getTime();
	
	timerID[objname] = setInterval('motion_sizeTick(\'' + objname + '\');',timerlen);
		
}

function motion_sizeTick(objname) {
	
	var elapsed = (new Date()).getTime() - startTime[objname];
	
	if (elapsed > slideAniLen) {
		
		motion_endSize(objname);
	
	} else {
	
		var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
		
		if (dir[objname] == "up") {
			d = startHeight[objname] + (d/1.5);
		}
		
		if (d >= endHeight[objname] && dir[objname] == "up") {
			motion_endSize(objname);
		}
		
		if (dir[objname] == "down") {
			d = startHeight[objname] - (d/1.5);
		}
		
		if (d <= endHeight[objname] && dir[objname] == "down") {
			motion_endSize(objname);
		}
		
		obj[objname].style.height = d + "px";
	
	}
	
	return;
	
}

function motion_endSize(objname) {
	
	clearInterval(timerID[objname]);
	
	obj[objname].style.visibility = "visible";
	
	obj[objname].style.height = endHeight[objname] + "px";
	obj[objname].style.height = "";
	
	delete(moving[objname]);
	delete(timerID[objname]);
	delete(startTime[objname]);
	delete(endHeight[objname]);
	delete(startHeight[objname]);
	delete(obj[objname]);
	delete(dir[objname]);
	
	return;
		
}