function popUp( url, width, height ) {

// increased height & width to accommodate zoom instructions
minWidth = 725;
minHeight = 725;
zoomPadding = 75;

    lnPadding = 26;
    if ( width == 0 || isNaN(width) || width < minWidth )	{
  	  cscrollbars = "yes";
      width=minWidth;
    }
    else	{
      cscrollbars = 'yes';
      width += lnPadding + 20;
    }

	if ( width > screen.availWidth - lnPadding )
		width = screen.availWidth - lnPadding;

    if ( height == 0 || isNaN(height)  )
      height = minHeight;
    else
      height += lnPadding + 20 + zoomPadding;

	if ( height > screen.availHeight - lnPadding )
		height = screen.availHeight - lnPadding;
		
//alert("height: " + height + " width: " + width);

    params = "resizable=yes,scrollbars=" + cscrollbars + ",width=" + width + ",height=" + height;
//alert('url:\n ' + url + '\nparams:\n' + params + '\nwidth: ' + width + '\nheight: ' + height);
    window.open( url, "fullsize", params);
  }