Hi
I am dealing with a strange issue with VIEWS, PDF gif image cannot be seen as a end user, however can be seen as a authorized user.

All I am trying to do is get a .pdf gif image shows up in views for my pdf links for everyone.

Here is the code I am using 

if ($data->node_data_field_altlink_field_altlink_fid != "") {
 return "<img src = '/images/ico_pdf.gif'>";
}
else {
return ' ';
}

Or is it permissions issue. please suggest me some ideas or how to fix this problem.
Thanks!