function roll(doThis) {

if (doThis=="r1") {
document.rate.src="images/rates2.gif"
   }
else if (doThis=="r2") {
document.rate.src="images/rates1.gif"
 }
if (doThis=="s1") {
document.service.src="images/service2.gif"
   }
else if (doThis=="s2") {
document.service.src="images/service1.gif"
 }
if (doThis=="l1") {
document.locator.src="images/site2.gif"
   }
else if (doThis=="l2") {
document.locator.src="images/site1.gif"
 }
if (doThis=="m1") {
document.map.src="images/map2.gif"
   }
else if (doThis=="m2") {
document.map.src="images/map1.gif"
 }
if (doThis=="p1") {
document.picture.src="images/pics2.gif"
   }
else if (doThis=="p2") {
document.picture.src="images/pics1.gif"
 }
if (doThis=="c1") {
document.contact.src="images/contact2.gif"
   }
else if (doThis=="c2") {
document.contact.src="images/contact1.gif"
 }
else {
return true
 }
}