shown=''
function OOpenFile(url) {
if( shown=='' || shown.closed) {
	shown=window.open(url,'OOpenFile','scrollbars=yes, status=no, high, width=420, height=520');
}
else{ 
	shown.close();
	shown=window.open(url,'OOpenFile','scrollbars=yes, status=no, high, width=420, height=520');
}
}