variable passing between forms

Hello I am new to php. I have a table that is populated with entries. when a user clicks on 1 I want it to open a new php form and send the ID (field in table) to the newly opened php form. everything seems to be working well I see that the variable is passed the value (ID) in the URL but when I reference the variable in the called php page the variable seems empty. here is the anchor link from first page with table: echo("<a href='indpaper.php?ID=" .$row["BiblioID"]. "'>"); this seems to be working fine. the URL: http://localhost/ebusiness/indpaper.php?ID=42 as you can see is being passed the value 42. however when I go to the indpaper.php and try use the ID variable it is empty, echo("ID to delete: " . $ID ); why is it empty?? can anyone help?? thanx in advance