if (document.images) {

cta1_over = new Image;
cta1_def = new Image;

cta2_over = new Image;
cta2_def = new Image;

cta3_over = new Image;
cta3_def = new Image;

cta4_over = new Image;
cta4_def = new Image;

cta1_over.src = "/images/cv-submission_hover.gif";
cta1_def.src = "/images/cv-submission.gif";

cta2_over.src = "/images/call-back-service_hover.gif";
cta2_def.src = "/images/call-back-service.gif";

cta3_over.src = "/images/locum-rates_hover.gif";
cta3_def.src = "/images/locum-rates.gif";

cta4_over.src = "/images/cta4_hover.gif";
cta4_def.src = "/images/cta4.gif";
}
else{
cta1_over = "";
cta1_def = "";

cta2_over = "";
cta2_def = "";

cta3_over = "";
cta3_def = "";

cta4_over = "";
cta4_def = "";

document.image1 = "";
document.image2 = "";
document.image3 = "";
document.image4 = "";
}