function openPopup( szTarget, iHeight, iWidth )
{
	if( iHeight == undefined ) {
		iHeight=520;
	}
	if( iWidth == undefined ) {
		iWidth=550;
	}
	location_top = (screen.height - iHeight )/2;
	location_left = (screen.width - iWidth )/2;
	win1 = open( szTarget, 'CONFIRM','resizable=no,scrollbars=yes,width=' + iWidth + ',height=' + iHeight + ',top='+location_top+',left='+ location_left );
	win1.focus();
}