var winnullWindow=null;

function winnull(mypage,myname,w,h,pos,infocus){

if(pos=='random'){

LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;

TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;}

if(pos=='center'){

LeftPosition=(screen.width)?(screen.width-w)/2:100;

TopPosition=(screen.height)?(screen.height-h)/2:100;}

else if((pos!='center' && pos!='random') || pos==null){LeftPosition=100;TopPosition=100;}settings='width='+ w + ',height='+ h + ',top=' + TopPosition + ',left=' + LeftPosition + ',location=no,directories=no,menubar=no,toolbar=no,status=no,scrollbars=no,resizable=yes,dependent=no';

winnullWindow=window.open('',myname,settings);

if(infocus=='front'){winnullWindow.focus();winnullWindow.location=mypage;}

}