function ShowEnlargement(id, width, height) {
	PopupScreenCentre("photo.asp?id=" + id,"_blank",width, height, 0)
}

function PopupScreenCentre(url,name,width,height,scrollbars,resizable) {
	if (lastWin && !lastWin.closed)
		lastWin.close()
	
	if (!resizable) 
		resizable = 0
	else
		resizable = 1
	
	var titleBarHeight, windowBorderWidth
	titleBarHeight = 24
	windowBorderWidth = 4

	var screenWidth, screenHeight
	screenWidth = 800
	screenHeight = 600

	if (window.screen) {
		if (window.screen.availWidth) {
			// ok browser has the appropriate properties we need to centre it
			screenWidth = window.screen.availWidth
			screenHeight = window.screen.availHeight
		}
	}

	var windowWidth = windowBorderWidth + width + windowBorderWidth
	var windowHeight = titleBarHeight + height + windowBorderWidth

	var left = (screenWidth - windowWidth) / 2
	var top = (screenHeight - windowHeight) / 2

	lastWin = window.open(url,name,'left='+left+',top='+top+',screenX='+left+',screenY='+top+',width='+width+',height='+height+',scrollbars='+scrollbars+',resizable='+resizable+',toolbar=0,location=0,directories=0,status=1,menubar=0,copyhistory=0')
}