//function to create popup windows for the photo gallery
function popUpWin(filename, height, width, caption) {
	var filename 		= filename;
	var height 			= height;
	var width 			= width;
	var caption 		= caption;
	
	myPopUp = window.open("popup.php?filename="+filename+"&height="+height+"&width="+width+'&caption='+caption+'','popup','width='+(width + 20)+",height="+(height + 70)+",scrollbars=yes,resizable=yes,toolbar=no,directories=no,location=no,menubar=no,status=no,left=0,top=0");
	//bring the popup window into focus
	myPopUp.focus();
}