function brol(picture, alternate, picname){
       document.images[picname].src=picture;
      }   

var gallery_currentPicture = 0;
var gallery_nPictures = 23;
var gallery_files = new Array();

gallery_files[0]="index/index001.jpg";gallery_files[1]="index/index002.jpg";gallery_files[2]="index/index003.jpg";gallery_files[3]="index/index004.jpg";gallery_files[4]="index/index005.jpg";gallery_files[5]="index/index006.jpg";gallery_files[6]="index/index007.jpg";gallery_files[7]="index/index008.jpg";gallery_files[8]="index/index009.jpg";gallery_files[9]="index/index010.jpg";gallery_files[10]="index/index011.jpg";gallery_files[11]="index/index012.jpg";gallery_files[12]="index/index013.jpg";gallery_files[13]="index/index014.jpg";gallery_files[14]="index/index015.jpg";gallery_files[15]="index/index016.jpg";gallery_files[16]="index/index017.jpg";gallery_files[17]="index/index018.jpg";gallery_files[18]="index/index019.jpg";gallery_files[19]="index/index020.jpg";gallery_files[20]="index/index021.jpg";gallery_files[21]="index/index022.jpg";gallery_files[22]="index/index023.jpg";gallery_files[23]="index/index024.jpg";gallery_files[24]="index/025.jpg";gallery_files[25]="index/026.jpg";gallery_files[26]="index/027.jpg";gallery_files[27]="index/028.jpg";gallery_files[28]="index/029.jpg";gallery_files[29]="index/030.jpg";gallery_files[30]="index/031.jpg";gallery_files[31]="index/032.jpg";	

/*  image suivante */
function gallery_showNextPicture()
{

	if(gallery_currentPicture == (gallery_nPictures-1)){
	
		gallery_currentPicture = 0;
	
	}else{
	
		gallery_currentPicture++;
	}
	
	gallery_changePicture(gallery_currentPicture);
}
 

/* image precedente */
function gallery_showPrevPicture()
{
	if(gallery_currentPicture == 0)
	{
		gallery_currentPicture = gallery_nPictures - 1;
	}
	else
	{
		gallery_currentPicture--;
	}
	
	gallery_changePicture(gallery_currentPicture);
}


/* change image */
function gallery_changePicture(index)
{ 
   brol(gallery_files[index], '', 'gallery_picture');
	gallery_currentPicture = index;	
}