shown=''
function OpenFile(url, wd, ht) {
var prm = 'scrollbars=no,status=no, high,width=' + wd + ',height=' + ht ;
if( shown=='' || shown.closed) {
	shown=window.open(url,'OpenFile',prm);
}
else{ 
	shown.close();
	shown=window.open(url,'OpenFile',prm);
}
}