function layer(url)
{
	var scroll = $('html').scrollTop;
	$('html').style.overflowY="hidden";
	isIE6 = /msie|MSIE 6/.test(navigator.userAgent);
	isIE8 = /msie|MSIE 8/.test(navigator.userAgent);

	if(!isIE6 && ! isIE8)
		$('frame').style.margin = '0px 0px 0px -498px';
	if(!isIE6 && isIE8)
		$('frame').style.margin = '0px 0px 0px -499px';
	if(scroll)
		$('html').scrollTop	= scroll;
	new Ajax.Updater
	(
		"popup",
		 root + "layer/show/",
		 {

			 method:"post",
			 parameters: "AJAX=showlayer&url="+url,
			 evalScripts:true
		 }
	);
}

function closeLayer()
{
	$('html').style.overflowY="scroll";
	$('frame').style.margin = '0px 0px 0px -490px';
	$('popup').innerHTML = '';
}