function poponclick(largeImage)
{
	var popupWindowWidth;
	var popupWindowHeight;
	var leftMarginValue;
	var topMarginValue;
	
	popupWindowWidth = 700;
	popupWindowHeight = 500;
	leftMarginValue = (screen.width-popupWindowWidth)/2;
	topMarginValue = (screen.height-popupWindowHeight)/2;

	testwindow= window.open('PopupPage.aspx?'+largeImage, 'imagewindow', config='height='+popupWindowHeight+', width='+popupWindowWidth+', left='+leftMarginValue+', top='+topMarginValue+', toolbar=no, menubar=no, scrollbars=no, resizable=no, location=no, directories=no, status=no');
}