// layer_util.js
// dependencies: browser_ver.js

function show(id) {
	if (ie5 || ns5) {
		if (null != document.getElementById(id)) 
			document.getElementById(id).style.visibility = "visible";
	}
	else if(ie4) {
		if (null != document.all(id))
			document.all(id).style.visibility = "visible";
	}
	else if (ns4) {
		if ("undefined" != typeof document.layers[id])
			document.layers[id].visibility = "show";
	}
}

function hide(id) {
	if (ie5 || ns5) {
		if (null != document.getElementById(id)) 
			document.getElementById(id).style.visibility = "hidden";
	}
	else if(ie4) {
		if (null != document.all(id))
			document.all(id).style.visibility = "hidden";
	}
	else if (ns4) {
		if ("undefined" != typeof document.layers[id])
			document.layers[id].visibility = "hide";
	}
}


function move(id,left,top) {
	if (ie5 || ns5) {
		document.getElementById(id).style.left = left;
		document.getElementById(id).style.top = top;	
	}
	else if (ie4) {
		document.all[id].style.left = left;
		document.all[id].style.top = top;
	}
	else if (ns4) {
		document.layers[id].left = left;
		document.layers[id].top = top;		
	}
}