Unable to change the visibility, does anyone see what I'm doing wrong?

function showLink()
{
  alert("in function");
  var pass = document.getElementById("pass").value;
  var valid = "3574Hoy";
  alert(valid);
  alert(pass);
  if (pass != valid)
  {
    alert("wrong"); 
  }
  else 
  {
    alert("correct");	
    document.getElementById("downloads").style.visibility = "visible";
  }
}