Image Switch Function Using Array?

I have the following as a code for an image rotation on each click (with three images)... when I load the page the first image loads fine and I click on it twice and the other two images switch smoothly, but then click a third time to go back to the first image and it doesn't go back to the first image. here's the javascript:

Code:

imgs=Array("pics/adv/chrebMs1.jpg","pics/adv/chrebMs2.jpg","pics/adv/chrebM.jpg");
var x=0;
function change() {

[code].....

and heres the html:

Code:

<img src="pics/adv/chrebMs1.jpg" id="chrsc" alt="" onclick="javascript:change();"/>