if (document.images) {

img_wildlife_emn        = new Image();
img_wildlife_emf        = new Image();
img_wildlife_emn.src    = "img/wildlife_em_on.gif";
img_wildlife_emf.src    = "img/wildlife_em_off.gif";

img_location_infon        = new Image();
img_location_infof        = new Image();
img_location_infon.src    = "img/location_info_on.gif";
img_location_infof.src    = "img/location_info_off.gif";

img_issuesn        = new Image();
img_issuesf        = new Image();
img_issuesn.src    = "img/issues_on.gif";
img_issuesf.src    = "img/issues_off.gif";

img_dos_and_dontsn        = new Image();
img_dos_and_dontsf        = new Image();
img_dos_and_dontsn.src    = "img/dos_and_donts_on.gif";
img_dos_and_dontsf.src    = "img/dos_and_donts_off.gif";

tortoisen        = new Image();
tortoisef        = new Image();
tortoisen.src    = "img/tortoise_on.gif";
tortoisef.src    = "img/tortoise_off.gif";

wing_beatsn        = new Image();
wing_beatsf        = new Image();
wing_beatsn.src    = "img/wing_beats_on.gif";
wing_beatsf.src    = "img/wing_beats_off.gif";

tortoise_formn        = new Image();
tortoise_formf        = new Image();
tortoise_formn.src    = "img/tortoise_form_on.gif";
tortoise_formf.src    = "img/tortoise_form_off.gif";

herpetologicaln  = new Image();
herpetologicalf  = new Image();
herpetologicaln.src    = "img/herpetological_on.gif";
herpetologicalf.src    = "img/herpetological_off.gif";

tortoise_adoptionn  = new Image();
tortoise_adoptionf  = new Image();
tortoise_adoptionn.src    = "img/tortoise_adoption_on.gif";
tortoise_adoptionf.src    = "img/tortoise_adoption_off.gif";

}