$(function() {   
                
                        var theWindow        = $(window),
                            $bg              = $("#bg"),
                            aspectRatio      = $bg.width() / $bg.height();
                                                                
                        function resizeBg() {
                                
                                if ( (theWindow.width() / theWindow.height()) < aspectRatio ) {
                                    $bg
                                        .removeClass()
                                        .addClass('bgheight');
                                } else {
                                    $bg
                                        .removeClass()
                                        .addClass('bgwidth');
                                }
                                                        
                        }
                                                                
                        theWindow.resize(function() {
                                resizeBg();
                        }).trigger("resize");
                
                });

function MM_showHideLayers() { //v9.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) 
  with (document) if (getElementById && ((obj=getElementById(args[i]))!=null)) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}