function preload_images() {
	// make sure that old browsers don't trip up on image arrays
	if (document.images) {
		//
		//  hover (mouseover) images here
		//
		buttonHover = new Object();
		buttonHover["title_musicvideos"] = new Image(73,12);
		buttonHover["title_musicvideos"].src = "/images/global/mainlabel_musicvideos_hover.gif";
		buttonHover["title_commercials"] = new Image(73,12);
		buttonHover["title_commercials"].src = "/images/global/mainlabel_commercials_hover.gif";
		buttonHover["title_narrative"] = new Image(73,12);
		buttonHover["title_narrative"].src = "/images/global/mainlabel_narrative_hover.gif";
		buttonHover["title_steadicam"] = new Image(73,12);
		buttonHover["title_steadicam"].src = "/images/global/mainlabel_steadicam_hover.gif";
		buttonHover["title_steadicam"] = new Image(73,12);
		buttonHover["title_steadicam"].src = "/images/global/mainlabel_steadicam_hover.gif";
		
		buttonHover["musicvideos_all"] = new Image(51,12);
		buttonHover["musicvideos_all"].src = "/images/global/mainlabel_showall_hover.gif";
		buttonHover["commercials_all"] = new Image(51,12);
		buttonHover["commercials_all"].src = "/images/global/mainlabel_showall_hover.gif";
		buttonHover["narrative_all"] = new Image(51,12);
		buttonHover["narrative_all"].src = "/images/global/mainlabel_showall_hover.gif";
		buttonHover["steadicam_all"] = new Image(51,12);
		buttonHover["steadicam_all"].src = "/images/global/mainlabel_showall_hover.gif";
		
		buttonHover["sub_musicvideos"] = new Image(66,10);
		buttonHover["sub_musicvideos"].src = "/images/global/submenu_musicvideos_hover.gif";
		buttonHover["sub_commercials"] = new Image(68,10);
		buttonHover["sub_commercials"].src = "/images/global/submenu_commercials_hover.gif";
		buttonHover["sub_narrative"] = new Image(53,10);
		buttonHover["sub_narrative"].src = "/images/global/submenu_narrative_hover.gif";
		buttonHover["sub_steadicam"] = new Image(55,10);
		buttonHover["sub_steadicam"].src = "/images/global/submenu_steadicam_hover.gif";
		buttonHover["sub_equipment"] = new Image(55,10);
		buttonHover["sub_equipment"].src = "/images/global/submenu_equipment_hover.gif";
		buttonHover["sub_links"] = new Image(28,10);
		buttonHover["sub_links"].src = "/images/global/submenu_links_hover.gif";
		buttonHover["sub_contact"] = new Image(44,10);
		buttonHover["sub_contact"].src = "/images/global/submenu_contact_hover.gif";
		
		buttonHover["link_gregschmitt"] = new Image(99,19);
		buttonHover["link_gregschmitt"].src = "/images/global/titlebar_greg_hover.gif";
		buttonHover["link_more"] = new Image(51,12);
		buttonHover["link_more"].src = "/images/global/catlabel_more_hover.gif";
		//
		//  normal (mouseout) images here
		//
		buttonNormal = new Object();
		buttonNormal["title_musicvideos"] = new Image(73,12);
		buttonNormal["title_musicvideos"].src = "/images/global/mainlabel_musicvideos_norm.gif";
		buttonNormal["title_commercials"] = new Image(73,12);
		buttonNormal["title_commercials"].src = "/images/global/mainlabel_commercials_norm.gif";
		buttonNormal["title_narrative"] = new Image(73,12);
		buttonNormal["title_narrative"].src = "/images/global/mainlabel_narrative_norm.gif";
		buttonNormal["title_steadicam"] = new Image(73,12);
		buttonNormal["title_steadicam"].src = "/images/global/mainlabel_steadicam_norm.gif";
		buttonNormal["title_steadicam"] = new Image(73,12);
		buttonNormal["title_steadicam"].src = "/images/global/mainlabel_steadicam_norm.gif";
		
		buttonNormal["musicvideos_all"] = new Image(51,12);
		buttonNormal["musicvideos_all"].src = "/images/global/mainlabel_showall_norm.gif";
		buttonNormal["commercials_all"] = new Image(51,12);
		buttonNormal["commercials_all"].src = "/images/global/mainlabel_showall_norm.gif";
		buttonNormal["narrative_all"] = new Image(51,12);
		buttonNormal["narrative_all"].src = "/images/global/mainlabel_showall_norm.gif";
		buttonNormal["steadicam_all"] = new Image(51,12);
		buttonNormal["steadicam_all"].src = "/images/global/mainlabel_showall_norm.gif";
		
		buttonNormal["sub_musicvideos"] = new Image(66,10);
		buttonNormal["sub_musicvideos"].src = "/images/global/submenu_musicvideos_norm.gif";
		buttonNormal["sub_commercials"] = new Image(68,10);
		buttonNormal["sub_commercials"].src = "/images/global/submenu_commercials_norm.gif";
		buttonNormal["sub_narrative"] = new Image(53,10);
		buttonNormal["sub_narrative"].src = "/images/global/submenu_narrative_norm.gif";
		buttonNormal["sub_steadicam"] = new Image(55,10);
		buttonNormal["sub_steadicam"].src = "/images/global/submenu_steadicam_norm.gif";
		buttonNormal["sub_equipment"] = new Image(55,10);
		buttonNormal["sub_equipment"].src = "/images/global/submenu_equipment_norm.gif";
		buttonNormal["sub_links"] = new Image(28,10);
		buttonNormal["sub_links"].src = "/images/global/submenu_links_norm.gif";
		buttonNormal["sub_contact"] = new Image(44,10);
		buttonNormal["sub_contact"].src = "/images/global/submenu_contact_norm.gif";
		
		buttonNormal["link_gregschmitt"] = new Image(99,19);
		buttonNormal["link_gregschmitt"].src = "/images/global/titlebar_greg_norm.gif";
		buttonNormal["link_more"] = new Image(51,12);
		buttonNormal["link_more"].src = "/images/global/catlabel_more_norm.gif";
	}
}		
		
function rollover(imageId, type) {

	var image = getRawObject(imageId);
	
	if (type == "hover") {
		if (imageId != activeId) {
			image.src = buttonHover[imageId].src;
		}
		return true;
	}
	else if (type == "normal") {
		if (imageId != activeId) {
			image.src = buttonNormal[imageId].src;
		}
		return true;
	}
	else if (type == "active") {
		if (activeId && (imageId != activeId)) {
			var active_img = getRawObject(activeId);
			active_img.src = buttonNormal[activeId].src;
		}
		image.src = buttonHover[imageId].src;
		activeId = imageId;
		return true; 
	}
	else
		return true;
}