var picArray= new Array();
var capArray= new Array();
var LastStep=0;
picArray[0]='images/gallery/case12.jpg';
picArray[1]='images/gallery/case11.jpg';
picArray[2]='images/gallery/case10.jpg';
picArray[3]='images/gallery/case9.jpg';
picArray[4]='images/gallery/case8.jpg';
picArray[5]='images/gallery/case7.jpg';
picArray[6]='images/gallery/case6.jpg';
picArray[7]='images/gallery/case5.jpg';
picArray[8]='images/gallery/case4.jpg';
picArray[9]='images/gallery/case3.jpg';
picArray[10]='images/gallery/case2.jpg';
picArray[11]='images/gallery/case1.jpg';
picArray[12]='images/gallery/case0.jpg';

function changepicture(Step)
{
LastStep= LastStep + Step;
/*carrousel*/
if (LastStep < 0) LastStep= picArray.length - 1;
if (LastStep >= picArray.length) LastStep=0;
var oPic= document.getElementById('mypictureid');
oPic.src= picArray[LastStep];
}