function newwin(n,w,h) {
var l=(screen.width-w)/2 ;
var t=(screen.height-h)/2 ;
window.open( n+".html","","width="+w+",height="+h+",left="+l+",top="+t,"directions=0","location=0","menubar=0","scrollbars=0","status=0","toolbar=0","resizable=0" ) ; 
}