function image_viewer(classnum, seqnum, maxrec, varfile){
	window.open(
	   'image_viewer.php?class=' + classnum + '&seqnum=' + seqnum + '&maxrec=' + maxrec + '&varfile=' + varfile, 
	   'gallery', 
	   'directories=no,top=0,left=100,width=600,height=530,location=no,menubar=no,resizable=yes,scrollbars=yes,toolbar=no,status=yes'
	);
}

function history_image(classnum, seqnum, maxrec){
	window.open(
	   'hist-gallery-image.php?class=' + classnum + '&seqnum=' + seqnum + '&maxrec=' + maxrec, 
	   'gallery', 
	   'directories=no,top=0,left=100,width=600,height=530,location=no,menubar=no,resizable=yes,scrollbars=yes,toolbar=no,status=yes'
	);
}

function open_tzun(id){
	window.open(
	   'open_tzun.php?id=' + id,
	   'tzun',
	   'directories=no,top=155,left=200,width=400,height=290,location=no,menubar=no,resizable=no,scrollbars=no,toolbar=no,status=yes'
	);
}

function delete_tzun(id){
	window.open(
	   'delete_tzun.php?id=' + id,
	   'tzun',
	   'directories=no,top=250,left=250,width=300,height=105,location=no,menubar=no,resizable=yes,scrollbars=no,toolbar=no,status=no'
	);
}

function save_tzun(){
	var labels = new Array(
		"Who","What","Month","Day",
		"Year","Hour","Second",
		"Where","Post Script"
	);
	var el = document.forms[0].elements;
	for(var i = 0 ; i < el.length-3 ; ++i) 
	{
		if( isEmpty( el[i].value ) && (i < 3 || i == 7) )
		{
			alert("Missing value: " + labels[i]);
			el[i].focus();
			return false;
		}		
	}
	return true;	
}