var imgSizeFlag = new Array();
var i;
// set a size flag to zero for each image
for ( i=0; i<document.images.length; i++ ) 
	{
	imgSizeFlag[i] = 0;
	if ( document.images[i].title == "" ) document.images[i].title="Click for larger image";
	}

function chsize( n )
{
if ( imgSizeFlag[n] == 0 )
	{
	imgSizeFlag[n] = 1;
	document.images[n].width *= 2;
	document.images[n].height *= 2;
	document.images[n].title = "Click for smaller image";
	}
else
	{
	imgSizeFlag[n] = 0;
	document.images[n].width /= 2;
	document.images[n].height /= 2;
	document.images[n].title = "Click for larger image";
	}
}