// JavaScript Document

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];}}
}

if (document.images)
{
	
	// home nav
	contact_hm_on	= new Image(100,19);
	contact_hm_on.src = "images/btn_hm_contact_on.gif";
	contact_hm_off	= new Image(100,19);
	contact_hm_off.src = "images/btn_hm_contact_off.gif";
	railcars_hm_off	= new Image(100,19);
	railcars_hm_off.src = "images/btn_hm_railcars_off.gif";
	railcars_hm_on	= new Image(100,19);
	railcars_hm_on.src = "images/btn_hm_railcars_on.gif";
	gallery_hm_off	= new Image(100,19);
	gallery_hm_off.src = "images/btn_hm_gallery_off.gif";
	gallery_hm_on = new Image(100,19);
	gallery_hm_on.src = "images/btn_hm_gallery_on.gif";
	about_hm_off	= new Image(100,19);
	about_hm_off.src = "images/btn_hm_about_off.gif";
	about_hm_on = new Image(100,19);
	about_hm_on.src = "images/btn_hm_about_on.gif";
	
	// inner nav
	contact_on	= new Image(100,19);
	contact_on.src = "../images/btn_contact_on.gif";
	contact_off	= new Image(100,19);
	contact_off.src = "../images/btn_contact_off.gif";
	railcars_off	= new Image(100,19);
	railcars_off.src = "../images/btn_railcars_off.gif";
	railcars_on	= new Image(100,19);
	railcars_on.src = "../images/btn_railcars_on.gif";
	gallery_off	= new Image(100,19);
	gallery_off.src = "../images/btn_gallery_off.gif";
	gallery_on = new Image(100,19);
	gallery_on.src = "../images/btn_gallery_on.gif";
	about_off	= new Image(100,19);
	about_off.src = "../images/btn_about_off.gif";
	about_on = new Image(100,19);
	about_on.src = "../images/btn_about_on.gif";
}

function changeImage(picName,imgName)
{
	
	if (document.images)
    {
    	imgOn = eval (imgName + ".src");
    	document[picName].src = imgOn;
	}
}

// NAV MENU FUNCTIONS
var cm=null;

function show(el,m) {
        var menuID = document.getElementById(m);
		if (menuID) {
                menuID.style.display='';
        }
        if ((menuID!=cm) && (cm)) cm.style.display='none'
        cm=menuID
}

function navSelectHm(navHmVar) {

if(navHmVar == "contact") {
	changeImage('btn_contact', 'contact_hm_on'); 
	show(this,'subnav_contact');
}

if(navHmVar == "about") {
	changeImage('btn_about', 'about_hm_on'); 
	show(this,'subnav_about');	
}

if(navHmVar == "railcars") {
	changeImage('btn_railcars', 'railcars_hm_on');
	show(this,'subnav_railcars');
}

if(navHmVar == "gallery") {
	changeImage('btn_gallery', 'gallery_hm_on');
	show(this,'subnav_gallery');

}

}


function navSelect(navVar) {

if(navVar == "contact") {
	changeImage('btn_contact', 'contact_on'); 
	show(this,'subnav_contact');
}

if(navVar == "about") {
	changeImage('btn_about', 'about_on'); 
	show(this,'subnav_about');	
}

if(navVar == "railcars") {
	changeImage('btn_railcars', 'railcars_on');
	show(this,'subnav_railcars');
}

if(navVar == "gallery") {
	changeImage('btn_gallery', 'gallery_on');
	show(this,'subnav_gallery');
}

}

//IMG POPUP
function popWin(img,wdth,hght) {
	
	specsstr = "'width=" + wdth + ",height=" + hght + ",toolbar=no,menubar=no,location=no,status=yes'";
	
	specs = eval(specsstr);
	
	window.open(img,'_blank',specs);
}