Form help

Each user has a long list of magazines to choose from. Problem is that for every magazine there is a checkbox and there are a lot of magazines to choose from (more than 100). I put all of them in one form. After submit I have to know which magazines user checked. Is there any more simple way than mine? Well here it is: I got a form with checkboxes which names are primary keys of every magazine. I use "sif_" in front because you cannot have variables like $123 => $sif_123. <input type="checkbox" name="sif_<? echo $wponud[6]; ?>" value="1"> After submitting the form I have to know which magazines user ordered. I go through user's magazines again and use eval function twice to get variable submited by form. <? while ($wponud = mysql_fetch_array($izpis_raw)) { $temp = "sif_$wponud[6]"; eval ("\$temp = \"$temp\";"); $temp = "$".$temp; eval ("\$temp = \"$temp\";"); if ($temp == 1) { // got it echo $wponud[6]."<br>"; } ?> If anybody can think of better way to do it, please let me know. tnx. mitja.