function showimage(url, title, pWidth, pHeight ) {
	if(pWidth == null) { pWidth = 640; }
	if(pHeight == null) { pHeight = 514; }
	$('#showimage').attr({src: url });

	var dialog = $("#showimage").dialog({
		autoOpen: false,
		modal: true, 
		width: pWidth, 
		height: pHeight,
		title: title, 
		show: 'slide'
	});
	
	dialog.dialog('option', 'title', title);
	dialog.dialog('open');
		
}