function image_rollover(image_name)
{
	document.getElementById('' + image_name + '').src = 'grfx/nav_' + image_name + '_over.gif';
}

function image_restore(image_name)
{
	document.getElementById('' + image_name + '').src = 'grfx/nav_' + image_name + '.gif';
}

function newsletter_popup()
{
	window.open('newsletter.html', "_blank","toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no,resizable=no, copyhistory=no, width=400, height=270");
}