function showhide(id) {
	var elem = document.getElementById(id);
		var str = elem.className;
		if (str.indexOf('hide') > -1)
		{
			elem.className = str.replace('hide', 'show');
		}
		else
		{
			elem.className = str.replace('show', 'hide');
	   }
	
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		news_over = newImage("images/news-over.gif");
		news_archive_over = newImage("images/news-archive-over.gif");
		shop_over = newImage("images/shop-over.gif");
		meeting_over = newImage("images/meeting-over.gif");
		convention_over = newImage("images/convention-over.gif");
		diagrams_over = newImage("images/diagrams-over.gif");
		projects_over = newImage("images/projects-over.gif");
		international_over = newImage("images/international-over.gif");
		contact_over = newImage("images/contact-over.gif");
		links_over = newImage("images/links-over.gif");
		preloadFlag = true;
	}
}


function checksub(f) {
    // check email address
    if (document.getElementById('subemail').value=="email@domain.com" || document.getElementById('subemail').value=="")
    {
        alert("Please enter your email address");
        document.getElementById('subemail').style.background = "#FBBF0A";
        return false;
    }
    // check name.
     if (document.getElementById('subname').value=="Your Name" || document.getElementById('subname').value=="")
    {
        alert("Please enter your name");
        document.getElementById('subname').style.background = "#FBBF0A";
        return false;
    }
    // confirmation
    var submit = (confirm('Is this correct? \nYour name:'+document.getElementById('subname').value +'.\nYour email: '+ document.getElementById('subemail').value));
    if (submit)
        f.submit();
}