var curPic = 1;  

function processPrevious() {
	
    if (curPic==0) 
    {
       curPic=Pictures.length - 1; 
    }
    else 
    {
      curPic--; 
    }
   document.myPicture.src=Pictures[curPic];  
	document.myPicture.parentNode.setAttribute('href', Pictures[curPic].replace(/slide_/gi, ''));
     
}

function processNext() {

    if (curPic==Pictures.length -1) 
    {
        curPic=0;
        }
        else 
        {
	    curPic++; 
		}
	document.myPicture.src=Pictures[curPic];
	document.myPicture.parentNode.setAttribute('href', Pictures[curPic].replace(/slide_/gi, ''));
       
}