/* opens popup in center */

var win= null;
function openwindow(url,w,h){
var winl = (screen.width-w)/2;
var wint = (screen.height-h)/2;
var settings ='height='+h+',';
settings +='width='+w+',';
settings +='top='+wint+',';
settings +='left='+winl+',';
settings +='scrollbars=no';
settings +='resizable=yes';
win=window.open(url,null,settings);
if(parseInt(navigator.appVersion) >= 4){win.window.focus();}
}