var iCurrent = 1;

function change_image(aPrevious, aNext, iMax, bMoveNext)
{
	var iPrevious;
	var iNext;

	if(bMoveNext)	iCurrent++;
	else		iCurrent--;

	iNext = iCurrent + 1;
	iPrevious = iCurrent - 1;

	if(iCurrent == 0) iCurrent = iMax;
	if(iCurrent > iMax) iCurrent = 1;

	if(iCurrent == iMax)	iNext = 1;
	if(iCurrent == 1)	iPrevious = iMax;

	aPrevious.href = aPrevious.href.substr(0, aPrevious.href.lastIndexOf("-") + 1) + iCurrent;
	aNext.href = aPrevious.href.substr(0, aPrevious.href.lastIndexOf("-") + 1) + iCurrent;
}