shown=''
function OpenFile(url) {
if( shown=='' || shown.closed) {

	shown=window.open(url,'OpenFile','scrollbars=no,status=no,width=w,height=h,resizable');
}
else{ 
	shown.close();
	shown=window.open(url,'OpenFile','scrollbars=no,status=no,width=w,height=h,resizable');
}
shown.moveTo(0,0);
shown.resizeTo(screen.availWidth,screen.availHeight);
}