var w=0;
if(w)  { if(!w.closed) w.close(); }; 
var num="";

function  resize()
{
if(w)  { if(!w.closed) w.close(); }; 
eval( "w=window.open('"+num+" ', '', 'top=100,left=100,toolbar=0,scrollbars=0,resizable=0,width=620,height=420')");
  w.focus()
}