slide show in javascript

<script language="JavaScript1.2">
<!--
// Cross-browser cleanup by Paul Anderson, CNET Builder.com. All rights reserved.
var numSlides = 5;
var currentSlide = numSlides;
// remove the next six lines if you don't want captions:
var captionTxt = new Array(numSlides);
captionTxt[1] = "Entrance to Pier 39"
captionTxt[2] = "Sea lions lounging around the pier"
captionTxt[3] = "Boats docked on the pier"
captionTxt[4] = "Underwater World whale mural"
captionTxt[5] = "Alcatraz, or The Rock"

function setUp() {
if (!document.all) {
   document.all = document;
   for (i=1;i<=numSlides;i++) document.all[("image"+i)].style=document.all[("image"+i)];
   }
switchSlide(1);
}

function switchSlide(sDir) {
newSlide = currentSlide + sDir;
if (!newSlide) newSlide=numSlides;
if (newSlide > numSlides) newSlide=1;
document.all[("image"+newSlide)].style.visibility="visible";
document.all[("image"+currentSlide)].style.visibility="hidden";
// remove the next line if you don't want captions:
document.all["captions"].document.forCaptions.captionsText.value=captionTx  t[newSlide];
currentSlide = newSlide;
}

//-->
</script>

Original - php Code if (newSlide > numSlides) newSlide=1;

 
if (newSlide > numSlides) newSlide=1; 

Original - php Code if (newSlide > numSlides) { location.replace( 'http://IWant2GoHere' ); };

 
if (newSlide > numSlides) {
   location.replace( 'http://IWant2GoHere' );
};