shown=''
function OpenFile(url, width, height) {
if( shown=='' || shown.closed) {
	shown=window.open(url,'OpenFile','scrollbars=yes,status=no, high, high,width=500,height=500,Top=50,Left=50,');
}
else{ 
	shown.close();
	shown=window.open(url,'OpenFile','scrollbars=yes,status=no, high,width=500,height=500,Top=50,Left=50,');
}
}