if (document.images) {

var splashbtn_doctorA = new Image()
splashbtn_doctorA.src = "images/splashbtn_doctor_off.gif"
var splashbtn_doctorZ = new Image()
splashbtn_doctorZ.src = "images/splashbtn_doctor_on.gif"

var splashbtn_notdoctorA = new Image()
splashbtn_notdoctorA.src = "images/splashbtn_notdoctor_off.gif"
var splashbtn_notdoctorZ = new Image()
splashbtn_notdoctorZ.src = "images/splashbtn_notdoctor_on.gif"

}
function act(imgName) {
if (document.images)
document[imgName].src = eval(imgName + 'Z.src')
}

function inact(imgName) {
if (document.images)
document[imgName].src = eval(imgName + 'A.src')
}