var preload = new Array('images/about_us_down.gif', 'images/about_us_up.gif', 'images/contact_us_down.gif', 'images/contact_us_up.gif', 'images/digital_media_down.gif', 'images/digital_media_up.gif', 
						'images/hospital_info_down.gif', 'images/hospital_info_up.gif', 'images/static_media_down.gif', 'images/static_media_up.gif');

var loader = new Array();
for(var i = 0; i < preload.length; i++){
   loader[i] = new Image();
   loader[i].src = preload[i];
}