function adjustColumns(){
var l = document.getElementById('leftcolumn').style.height;
var r = document.getElementById('rightcolumn').style.height;
alert ('leftcol height is ' + l + 'rtcol height is '+ r);
if (l > r) r = l;
else if (l < r ) l = r; 
	

}

//construct an array of image URLs
quoteArray = new Array( 
"",
"pix_exterior.jpg",
"pix_stglass.jpg",
"pix_altar.jpg");

//construct an array of image captions
altArray = new Array( 
"",
"St. Paul church exterior",
"Detail of stained glass window",
"Stained glass behind the altar in the sanctuary");


function changepix(){
  //Generate a random number to select a URL in the array:
	//randomNumb = Math.round(Math.random()*4)+1;//returns integer from 1 to 5
	randomNumb = Math.round(Math.random()*2)+1;//returns integer from 1 to 2
	quotesrc=quoteArray[randomNumb];
	altsrc=altArray[randomNumb];
	
  //write to the HTML page:
	document.open();
	document.write ( '<img src=\"images/'  + quotesrc + '\" alt=\"' + altsrc + '\" width=\"300\" height=\"200\">'  );
	document.close();
}