function openWin(w,h,url) {
var width_sc  = Math.floor((screen.availWidth-w)/2);
var height_sc = Math.floor((screen.availHeight-h)/2);
window.open(url,"page","toolbar=0,location=0,directories=0,status=0,scrollbars=yes,resizable=1,menubar=0,top="+height_sc+",left="+width_sc+",width="+w+",height="+h);
}