function centerWindow(url,name)
			{
			if (document.all) {var xMax = screen.width, yMax = screen.height} 
			else if (document.layers) {var xMax = window.outerWidth, yMax = window.outerHeight} 
			else {var xMax = 640, yMax=480}; var xOffset = (xMax - 200)/2, yOffset = (yMax - 200)/2; window.open(url,name,'width=300,height=240,scrollbars=1,screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
			}