shown=''
function OpenFile(url) {
if( shown=='' || shown.closed) {
	shown=window.open(url,'OpenFile','scrollbars=yes,status=yes, high,width=500,height=374');
}
else{ 
	shown.close();
	shown=window.open(url,'OpenFile','scrollbars=yes,status=yes, high,width=500,height=374');
}
}