window.attachEvent("onload", alphaSupport);
if (navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer" && window.attachEvent) {
	window.attachEvent("onload", alphaSupport);
	document.writeln('<style type="text/css">img { visibility:hidden; } </style>');
}
function fnLoadPngs() {
	var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
	var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5 && Number(rslt[1]) < 7);
	for (var i = document.images.length - 1, img = null; (img = document.images[i]); i--) {
		if (itsAllGood && img.src.match(/\.png$/i) && img.alt.match(/\PNG32$/i) != null) {
			var src = img.src;
			img.style.width = img.width + "px";
			img.style.height = img.height + "px";
			img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')"
			img.src = "images/x.gif";
		}
		img.style.visibility = "visible";
	}
}
function MM_findObj(n, d) { //v4.01
  var p,i,img;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(img=d[n])&&d.all) img=d.all[n]; for (i=0;!img&&i<d.forms.length;i++) img=d.forms[i][n];
  for(i=0;!img&&d.layers&&i<d.layers.length;i++) img=MM_findObj(n,d.layers[i].document);
  if(!img && d.getElementById) img=d.getElementById(n); return img;
}
function MM_swapImage() { //v3.0
	var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
	var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5 && Number(rslt[1]) < 7);
  var i,j=0,img,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((img=MM_findObj(a[i]))!=null){document.MM_sr[j++]=img; if(!img.oSrc) img.oSrc=img.src; img.src=a[i+2];
  	if (itsAllGood) {
   	 img.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + img.src + "', sizingMethod='scale')";
     img.src = "images/x.gif";
}
}
}
function MM_swapImgRestore() { //v3.0
	var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
	var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5 && Number(rslt[1]) < 7);
  var i,img,a=document.MM_sr; for(i=0;a&&i<a.length&&(img=a[i])&&img.oSrc;i++) {img.src=img.oSrc;
  	if (itsAllGood) {
   	img.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + img.src + "', sizingMethod='scale')";
    img.src = "images/x.gif";
}
}
}
function MM_preloadimages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadimages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
MM_preloadimages(
'images/logo_sierravideo.png',
'images/logo_gsa_dark.png',
'images/header_menu_button-1.png',
'images/header_menu_rollover-1.png',
'images/header_menu_button-2.png',
'images/header_menu_rollover-2.png',
'images/header_menu_button-3.png',
'images/header_menu_rollover-3.png',
'images/header_menu_button-4.png',
'images/header_menu_rollover-4.png',
'images/header_menu_button-5.png',
'images/header_menu_rollover-5.png',
'images/header_menu_button-6.png',
'images/header_menu_rollover-6.png');
function alphaSupport() {
MM_swapImage('header_menu_button-1','','images/header_menu_rollover-1.png');
MM_swapImgRestore();
MM_swapImage('header_menu_button-2','','images/header_menu_rollover-2.png');
MM_swapImgRestore();
MM_swapImage('header_menu_button-3','','images/header_menu_rollover-3.png');
MM_swapImgRestore();
MM_swapImage('header_menu_button-4','','images/header_menu_rollover-4.png');
MM_swapImgRestore();
MM_swapImage('header_menu_button-5','','images/header_menu_rollover-5.png');
MM_swapImgRestore();
MM_swapImage('header_menu_button-6','','images/header_menu_rollover-6.png');
MM_swapImgRestore();
fnLoadPngs();
}