var ie = (document.all) ? true : false
var ns = (document.layers) ? true : false
var ns6 = (!document.all && document.getElementById) ? true : false;

function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()')
		eval(imgObj+'.src = "'+imgSrc+'"')
	}
}

preload('n_what_on','images/nav/n_what_on.gif')
preload('n_what_off','images/nav/n_what_off.gif')
preload('n_service_on','images/nav/n_service_on.gif')
preload('n_service_off','images/nav/n_service_off.gif')
preload('n_contact_on','images/nav/n_contact_on.gif')
preload('n_contact_off','images/nav/n_contact_off.gif')
preload('n_faq_on','images/nav/n_faq_on.gif')
preload('n_faq_off','images/nav/n_faq_off.gif')
preload('n_order_on','images/nav/n_order_on.gif')
preload('n_order_off','images/nav/n_order_off.gif')


function chgImg(imgField,newImg) {
	if (ns) {eval('document.images[imgField].src = '+newImg+'.src')}
	if (ie) {document[imgField].src = eval(newImg+'.src')}
	if (ns6) {document.images[imgField].src = eval(newImg+'.src');}
}

function popup(winurl){
	window.open(winurl,"Redwood","height=600,width=458,menubar=0,resizeable=0,location=0,scrollbars=1,status=0,titlebar=0,toolbar=0");
}