function precacheImages () {
	var headerimages = [
		'images/header/corporate_profile_over.gif', // header text rollovers
		'images/header/professional_services_over.gif',
		'images/header/construction_expertise_over.gif',
		'images/header/industry_resources_over.gif',
		'images/header/contact_spire_over.gif',
		'images/header/client_login_over.gif'
	];
	for (var i = 0; i < headerimages.length; i++){
		var img = new Image();
		img.src = headerimages[i];
	}
}

function openwindow(url) {
	winHandle = this.open(url, "CtrlWindow", "toolbar=yes,menubar=yes,location=yes,scrollbars=yes,resizable=yes,width=900,height=400");
}