var imageViewer;

function imageviewer(url)
{
	if (imageViewer != undefined && !imageViewer.closed)
		return;
		
	imageViewer = window.open(url, 'assetimageComponentPopUp',
	                               'toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,width=1000,height=700'
						   );
}