function popup(url) {   
	var w=600;        
	var h=500;        
	var scroll='no';    
	var winl = (screen.width-w)/2;    
	var wint = ((screen.height-h)/2)-30;    
	var settings  ='height='+h+',';        
	settings +='width='+w+',';        
	settings +='top='+wint+',';        
	settings +='left='+winl+',';        
	settings +='scrollbars=yes,';        
	settings +='resizable=no,';        
	settings +='menubar=0,status=0';    
	win=window.open(url,"popup",settings);    
	if(parseInt(navigator.appVersion) >= 4){win.window.focus();}
}

function MM_showHideLayers() {
	var i,p,v,obj,args=MM_showHideLayers.arguments;
	for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];    
	if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }    
	obj.visibility=v; }
}