function PopupCenter(pageURL, title,w,h) 
{
var left = (screen.width/2)-(w/2);
var top = (screen.height/2)-(h/2);
var targetWin = window.open (pageURL, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=no, copyhistory=no, width='+w+', height='+h+', top='+top+', left='+left);
}

document.write('<table><tr><td align="center"><a href="#" onclick="PopupCenter(\'http://www.samareites.gr/nm.php?view=add\', \'pop\',800,600);"><img style="border:0pt" src="http://www.samareites.gr/images/editor/UserFiles/Image/aitisi/eggrafi250.jpg" width="150" /></a></td></tr></table>');