ns4 = (document.layers)? true:false;
	ie4 = (document.all)? true:false;

	function show(id,e)
	{
		e.cancelBubble=true;
	    if(changeObjectVisibility(id, 'visible','inline'))
		{
			hideShowCovered(id);
			return true;
		}
	    else 
			return false;
	    
		return;
	}

	function hide(id,e)
	{
		if (ie4)
		{
			el=document.all[id];
			var p = getAbsolutePos(el);
			var EX1 = p.x;
			var EX2 = el.offsetWidth + EX1;
			var EY1 = p.y;
			var EY2 = el.offsetHeight + EY1;
			mX=event.clientX;
			mY=event.clientY;
	//		alert('ex1='+EX1+',ey1='+EY1+',ex2='+EX2+',ey2='+EY2+'\nmX='+mX+',mY'+mY);
			if ((mX>EX1+1 && mX<EX2) && (mY>EY1 && mY<EY2))	return false;
			hideShowCovered('winda_out');
		}

		e.cancelBubble=true;
	    if(changeObjectVisibility(id, 'hidden','none'))
		{
			return true;
		}
	    else
			return false;
	}

	function getStyleObject(objectId) {
		// cross-browser function to get an object's style object given its id
		if(document.getElementById && document.getElementById(objectId)) {
		// W3C DOM
		return document.getElementById(objectId).style;
		} else if (document.all && document.all(objectId)) {
		// MSIE 4 DOM
		return document.all(objectId).style;
		} else if (document.layers && document.layers[objectId]) {
		// NN 4 DOM.. note: this won't find nested layers
		return document.layers[objectId];
		} else {
		return false;
		}
	} // getStyleObject

	function changeObjectVisibility(objectId, newVisibility,newDisplay) {
		// get a reference to the cross-browser style object and make sure the object exists
		var styleObject = getStyleObject(objectId);
		if(styleObject)
		{
			styleObject.visibility = newVisibility;
			styleObject.display = newDisplay;
			return true;
		} 
		else
		{
			//we couldn't find the object, so we can't change its visibility
			return false;
		}
	} // changeObjectVisibility

	function hideShowCovered(id) {
		if (ie4)
			el=document.all[id];
		else
			el=document.layers[id];

		var tags = new Array("applet", "iframe", "select");
		var res;

		var p = getAbsolutePos(el);
		var EX1 = p.x;
		var EX2 = el.offsetWidth + EX1;
		var EY1 = p.y;
		var EY2 = el.offsetHeight + EY1;
//		alert ('EX1='+EX1+',EY1='+EY1);
		for (var k = tags.length; k > 0; ) {
			var ar = document.getElementsByTagName(tags[--k]);
			var cc = null;

			for (var i = ar.length; i > 0;) {
				cc = ar[--i];

				p = getAbsolutePos(cc);
				var CX1 = p.x;
				var CX2 = cc.offsetWidth + CX1;
				var CY1 = p.y;
				var CY2 = cc.offsetHeight + CY1;

				if ((CX1 > EX2) || (CX2 < EX1) || (CY1 > EY2) || (CY2 < EY1)) {
					cc.style.visibility = "visible";
					res=1;

				} else {
					cc.style.visibility = "hidden";
					res=0;
				}
			}
		}
		return res;
	};

	function getAbsolutePos(el) {
		var r = { x: el.offsetLeft, y: el.offsetTop };
		if (el.offsetParent) {
			var tmp = getAbsolutePos(el.offsetParent);
			r.x += tmp.x;
			r.y += tmp.y;
		}
		return r;
	};