var isDOM,isIE,isNN4,isOpera,isIE4,t1=0;

if (navigator.userAgent.indexOf('Opera')!=-1) isOpera=1;
if (document.getElementById) isDOM=1;
if (document.all && !isOpera) isIE=1;
if (document.layers) isNN4=1;
if (!isDOM && document.all) isIE4=1;

function getObj(n) {
	if(isDOM) return document.getElementById(n);
	if(isIE) return document.all[n];
	return document.layers[n];
}

function getStyle(n) {
	var obj=getObj(n);
	if(obj) {
		if(isNN4) return obj;
		return obj.style;
	}
}

function getPosObj(n, e) {
	if(isNN4) {
		this.x=e.pageX;
		this.y=e.pageY;
		this.w=this.h=0;
		return;
	}
	var obj=getObj(n);
	this.x=obj.offsetLeft;
	this.y=obj.offsetTop;
	this.w=obj.offsetWidth;
	this.h=obj.offsetHeight;
	while((obj=obj.offsetParent)!=null && obj.tagName!='BODY') {
		this.x+=obj.offsetLeft;
		this.y+=obj.offsetTop;
		if(isNaN(obj.border)) continue;
		this.x+=parseInt(obj.border);
		this.y+=parseInt(obj.border);
	}
}

function setView(n, s) {
	var obj=getStyle(n);
	if(obj) {
		if (isNN4) obj.visibility=(s)?'show':'hide';
		else obj.visibility=(s)?'visible':'hidden';
		if(!s) {
			obj.top = 0;
			obj.left = 0;
		}
	}
}

function show(id) {
	clearTimeout(t1);
	var p, obj=getStyle('sub'+id);
	if (obj) {
		p=new getPosObj(id);
		obj.left=p.x;
		obj.top=p.y + p.h + 2;
		setView('sub'+id, 1);
	}
}
function disable(id) {
	t1=setTimeout("setView('sub"+id+"', 0)", 500);
}