var evalWin = null;

function popUpEval(url)
{
    popUpEvalClose();
    w = 300;
    h = 200;
    if(self.outerWidth!=null&&self.outerHeight!=null&&self.screenX!=null&&self.screenY!=null) {
        pTop = (self.outerHeight-h)/2+self.screenY;
        pLeft = (self.outerWidth-w)/2+self.screenX;
    } else if(screen.availHeight!=null&&screen.availWidth!=null) {
        pTop = (screen.availHeight-h)/2;
        pLeft = (screen.availWidth-w)/2;
    } else {
        pTop = 20;
        pLeft = 20;
    }
    var opt = 'height='+h+',width='+w+',top='+pTop+',left='+pLeft+',toolbar=no,menubar=yes,location=no,resizable=yes,scrollbars=no,status=no';
    evalWin = window.open(url,'',opt);
    evalWin.focus();
}

function popUpEvalClose()
{
    if(evalWin!=null&&!evalWin.closed)
        evalWin.close();
}