shown=''
function OpenFile(url) {
if( shown=='' || shown.closed) {
	shown=window.open(url,'OpenFile','scrollbars=no,status=no, high,width=600,height=310');
}
else{
	shown.close();
	shown=window.open(url,'OpenFile','scrollbars=no,status=no, high,width=600,height=310');
}
}