var numPict=0;
function previousPict() 
{
	numPict--; 
	if(numPict<0)
	{
		numPict=maxNumPict-1;
	}
	document['pict'].src = pictures[numPict]; 
}
function nextPict() 
{
	numPict++; 
	if(numPict==maxNumPict) 
	{
		numPict=0
	} 
	document['pict'].src = pictures[numPict]; 
}