function popup(newurl,windowname){
if (eval('typeof '+windowname+' != \'undefined\'')) {eval(windowname+'.close();');};
settings='toolbar=no';
settings+=',location=no';
settings+=',directories=no';
settings+=',status=no';
settings+=',menubar=no';
settings+=',scrollbars=yes';
settings+=',resizable=no';
settings+=',width=450';
settings+=',height=450';
settings+=',left=10';
settings+=',top=10';
myWindow=window.open(newurl,windowname,settings);
}