var movenum = 0;
function picViewerSwapImage(movenum){
	currentpicture += movenum;
	if (currentpicture < 0){
		currentpicture	= lastpicture;
	}
	if (currentpicture > lastpicture){
		currentpicture	= 0;
	}
	val = picviewerpics[currentpicture];
	if (val){
		document.getElementById("picviewer_pic").setAttribute("src", val);
		document.getElementById("picviewer_num").innerHTML=(currentpicture+1)+"/"+(lastpicture+1);
	}
}