// JavaScript Document
function open_window(larg, altura, window, file){
    msgWindow=open(file,window,'directories=no,toolbar=no,location=no,status=no,menubar=no,scrollbars=no,copyhistory=no,resizable=no,width=' + larg + ',height='  + altura);
    msgWindow.moveTo(screen.width/2-larg/2,screen.height/2-altura/2-20); 
}

function esconde(){
document.body.style.overflow='hidden';
}