var NaviWin;

var sWidth;
var sHeight; 
var offsetX;
var offsetY;

sWidth = screen.width;
sHeight = screen.height; 
offsetX = 0;
offsetY = 0;

offsetX = (sWidth/2)-300;
offsetY = (sHeight/2)-200;

function openNavi(htmlloc)
{
        if((NaviWin==null)||(NaviWin.closed))
        {NaviWin=window.open(htmlloc,"Details",'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width=700,height=600,left=' + offsetX + ', top=' + offsetY + '');
    }
    else
    {
    NaviWin.close();
    NaviWin=window.open(htmlloc,"Details",'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width=700,height=600,left=' + offsetX + ', top=' + offsetY + '');
    }
}

function closeWin()
{
    if(!((NaviWin==null)||(NaviWin.closed)))
    {
    NaviWin.close();
    }
}