var OverYes = 0;
var OverLeft = -1;
var OverRight = +1;
var last_button = -1;

function getLeft(obj) {
	var curleft = 0;
	if (obj.offsetParent) {
		while (obj.offsetParent) {
			if(obj.style.position != "absolute") {
				curleft += obj.offsetLeft;
			}
			obj = obj.offsetParent;
		}
	}
	else if(obj.x) {
		curleft += obj.x;
	}
	return curleft;
}

function getTop(obj) {
	var curtop = 0;
	if (obj.offsetParent) {
		while (obj.offsetParent) {
			if(obj.style.position != "absolute") {
				curtop += obj.offsetTop;
			}
			obj = obj.offsetParent;
		}
	}
 	else if(obj.y) {
		curtop += obj.y;
	}
	curtop -= 1;
	return curtop;
}

function getWidth(obj) {
	return obj.offsetWidth;
}

function getHeight(obj) {
	return obj.offsetHeight;
}

function IsOverButton(e,button) {
	var x, y, w;

	if(!e) e = window.event;
	x = e.pageX-getLeft(button);
	y = e.pageY-getTop(button);
	w = getWidth(button);
	if( y <= ( -(29/25)*x + 29 ))
		return OverLeft;
	if( y > ( -(29/25)*(x-w) + 4 ))
		return OverRight;
	return OverYes;
}
function ClickMenuButton(e,id,s) {
	var button = document.getElementById('button-'+id);
	var dir;

	if(!button)
		return false;
	dir = IsOverButton(e, button);
	if(dir==OverYes) {
		document.location = button.childNodes[1];
	}
	if(s==0)
		ClickMenuButton(e,id+dir,1);
}
function OverMenuButton(e,id,s) {
	var button = document.getElementById('button-'+id);
	var dir;

	if(!button)
		return false;
	dir = IsOverButton(e, button);
	if( (dir==OverYes) || (s==0 && OverMenuButton(e,id+dir,1)) ) {
		if(dir == OverYes)
		{
			OffMenuButton(e,last_button,1);
			last_button = id;
			button.setAttribute('class', 'hilight-button');
		}
		else
			button.setAttribute('class', 'normal-button');
		button.style.cursor = 'pointer';
		return true;
	}
	button.setAttribute('class', 'normal-button');
	button.style.cursor = 'default';
	return false;
}
function OffMenuButton(e,id,s) {
	var button = document.getElementById('button-'+id);
	if(!button)
		return;
	button.setAttribute('class', 'normal-button');
}