var cached=0;

if (document.images){

the_about_off = new Image()
the_about_off.src = "intro_images/about_off.gif"
the_about_on = new Image()
the_about_on.src = "intro_images/about_on.gif"

the_contact_off = new Image()
the_contact_off.src = "intro_images/contact_off.gif"
the_contact_on = new Image()
the_contact_on.src = "intro_images/contact_on.gif"

the_history_off = new Image()
the_history_off.src = "intro_images/history_off.gif"
the_history_on = new Image()
the_history_on.src = "intro_images/history_on.gif"

the_menu_off = new Image()
the_menu_off.src = "intro_images/menu_off.gif"
the_menu_on = new Image()
the_menu_on.src = "intro_images/menu_on.gif"

the_email_off = new Image()
the_email_off.src = "images/email.gif"
the_email_on = new Image()
the_email_on.src = "images/email_on.gif"

the_map_off = new Image()
the_map_off.src = "images/map.gif"
the_map_on = new Image()
the_map_on.src = "images/map_on.gif"

cached=1;
}

function imageOn(imgName) {
	if (cached==1) {
	lineOn = eval("the_" + imgName + "_on.src");
	document [imgName].src= lineOn;
	}
}

function imageOff(imgName) {
	if (cached==1) {
	lineOff = eval("the_" + imgName + "_off.src");
	document [imgName].src= lineOff;
	}
}