var mythumbwin;

function thumbwin ( URL,iW,iH ) {

	if ( mythumbwin && typeof(mythumbwin) == 'object' && ! mythumbwin.closed  ) {

		mythumbwin.close ( );

	}

	mythumbwin = window.open ( URL, 'mythumbwin', 'toolbar=no, width=' + ( iW + 24 ) + ', height=' + ( iH + 40 ) + ', resizable=yes, scrollbars=no, left=120, top=120' ); 

	mythumbwin.focus ( );

}