if (document.images) {
	n1on = new Image();    n1on.src = "images/nav-home-on.gif";
	n2on = new Image();    n2on.src = "images/nav-about-on.gif";
	n3on = new Image();    n3on.src = "images/nav-products-on.gif";
	n4on = new Image();    n4on.src = "images/nav-contact-on.gif";
	n5on = new Image();    n5on.src = "images/nav-testimonials-on.gif";
}

function imgOn(imgName) {
	if (document.images) {
		oSrc=document[imgName].src;
		document[imgName].src = eval(imgName + "on.src");
	}
}

function imgOff(imgName) {
	if(oSrc){
		document[imgName].src = oSrc;
	}
}

function echoEMailLink(user,domain,linkText,additionalHTML){
	var email = user + '@' + domain;
	if(!linkText) linkText = email;
	if(!additionalHTML) additionalHTML = '';
	document.write('<a href="mailto:' + email + '" ' + additionalHTML + '>' + linkText + '<\/a>');
}

function echoEMail(user,domain) {
	document.write(user + '@' + domain);
}

function set_return_url(form_name,link) {
	var f = window.document.forms[form_name];
	f.attributes['action'].value = link.attributes['href'].value;
	//alert(f.attributes['action'].value);
	f.submit();
}

function set_form_element(form_name,element_name,element_value) {
  var f = document.forms[form_name];
  f.elements[element_name].value = element_value;
  f.submit();
}

function show_product_details(prod_id) {
  width = 400;
  height = 500;
  window.open("product.php?action=popup_product_description&product_id="+prod_id,'product_details','width='+width+',height='+height+',resizable=yes,scrollbars=yes');
}

function show_substitutes(replacement_info) {
  width = 600;
  height = 600;
  window.open("product_replacement.php?action=list&replacement_info="+replacement_info,'product_substitutes','width='+width+',height='+height+',resizable=yes,scrollbars=yes');
}