var popup;
function popPhoto( linkto, winName, width, height )
{
	var w = 640, h = 480, popW = 800, popH = 600, popLeft, popTop;
	var minPopW = 240, minPopH = 240;
	
	if ( width )
	  popW = width;
	if ( height )
		popH = height;
	if ( popW < minPopW )
		popW = minPopW;
	if ( popH < minPopH )
		popH = minPopH;

	if ( document.all || document.layers )
  {
    w = screen.availWidth;
    h = screen.availHeight;
  }
	else if (window && window.screen && window.screen.availWidth)
	{
		w = window.screen.availWidth;
		h = window.screen.availHeight;
	}
	popLeft = (w-popW)/2;
	popTop = (h-popH)/2;
  
	popup = window.open(linkto, winName,
                        'menubar=no,scrollbars=yes,resizable=yes,width=' + popW + ',height=' + popH + ',screenX=' + popLeft + ',screenY=' + popTop + ',left=' + popLeft + ',top=' + popTop );
}