javascript - keep getting php white screen of death when i try to add a confirmation box -

i trying make confirmation box when user deletes entry done echo "<a href=\"delete.php?sqluid=".$row[sqluid]."\"><img title='delete row' alt=\"delete\" class='del' src='images/delete.png'/></a></form></div>\n";statement. tried using "onlick" operator , javascript href redirect delete statement. tried 6 different sets of code found on site dont think implementing correctly. keep getting undefined constant error when check php log

<?php  //get database credentials require 'config.php';  // connect mysql database server. mysql_connect ($dbhost, $dbusername, $dbuserpass); //select database mysql_select_db($dbname) or die('cannot select database');  require 'header.php';  $query = "select * ring29 order `ring29`.`ospfarea`,`dot1q`,`subnethost` asc;";  $result = mysql_query($query) or die(mysql_error());  //count number of rows returned $count = mysql_num_rows($result);  //table header echo "<div><table id=\"tableheader\" bgcolor=\"#4382b5\">\n"; echo "<tr>\n"; echo "<td>&nbsp;         sql uid...........</td>\n"; echo "<td>&nbsp;  market:</td>\n"; echo "<td>&nbsp;      market code:</td>\n"; echo "<td>&nbsp;  ospf area:</td>\n"; echo "<td>&nbsp;  primary tag:</td>\n"; echo "<td>&nbsp;  802.1q:</td>\n"; echo "<td>&nbsp;  subnet/host:</td>\n"; echo "<td>&nbsp; ipv6 subnet/host:</td>\n"; echo "<td>&nbsp;slot/port:</td>\n"; echo "<td>&nbsp;cmts gw node:</td>\n"; echo "<td>&nbsp;slot/port:</td>\n"; echo "<td>&nbsp;ipv6 subnet/host:</td>\n"; echo "<td>&nbsp;subnet/host:</td>\n"; echo "<td>&nbsp;802.1q:</td>\n"; echo "<tr>"; echo "</table></div>"; if ($count !== 0) {                         while($row = mysql_fetch_array($result)) {                                 echo "<div class=\"addform\"><form method='get' action=\"update.php\">\n";                                 echo "  <input type=\"text\" value=\"".$row[sqluid]."\" name=\"sqluid\">\n";                                 echo "  <input type=\"text\" name=\"market\" value=\"".$row[market]."\"/>\n";                                 echo "  <input type=\"text\" name=\"mktcode\" value=\"".$row[mktcode]."\"/>\n";                                 echo "  <input type=\"text\" name=\"ospfarea\" value=\"".$row[ospfarea]."\"/>\n";                                 echo "  <input type=\"text\" name=\"primarytag\" value=\"".$row[primarytag]."\"/>\n";                                 echo "  <input type=\"text\" name=\"dot1q\" value=\"".$row[dot1q]."\"/>\n";                                 echo "  <input type=\"text\" name=\"subnethost\" value=\"".$row[subnethost]."\"/>\n";                                 echo "  <input type=\"text\" name=\"ipv6subnethost\" value=\"".$row[ipv6subnethost]."\"/>\n";                                 echo "  <input type=\"text\" name=\"slotport\" value=\"".$row[slotport]."\"/>\n";                                 echo "  <input type=\"text\" name=\"cmtsgwnode\" value=\"".$row[cmtsgwnode]."\"/>\n";                                 echo "  <input type=\"text\" name=\"slotport1\" value=\"".$row[slotport1]."\"/>\n";                                 echo "  <input type=\"text\" name=\"ipv6subnethost1\" value=\"".$row[ipv6subnethost1]."\"/>\n";                                 echo "  <input type=\"text\" name=\"subnethost1\" value=\"".$row[subnethost1]."\"/>\n";                                 echo "  <input type=\"text\" name=\"dot1q1\" value=\"".$row[dot1q1]."\"/>\n";                                 echo "  <input type=\"image\" src=\"images/update.png\" alt=\"update row\" class=\"update\" title=\"update row\">\n";                                 echo "<a href=\"delete.php?sqluid=".$row[sqluid]."\"><img title='delete row' alt=\"delete\" class='del' src='images/delete.png'/></a></form></div>\n";                     }                 echo "</table><br />\n";         } else {                 echo "<b><center>no data</center></b>\n";         }         echo "<div>add row:</div>\n";         echo "<div class=\"addform\"><form method='get' action=\"add.php\">\n".         "       <input type=\"text\" name=\"sqluid\" value=\"enter unique number\"/>\n".         "       <input type=\"text\" name=\"market\"/>\n".         "       <input type=\"text\" name=\"mktcode\"/>\n".         "       <input type=\"text\" name=\"ospfarea\"/>\n".         "       <input type=\"text\" name=\"primarytag\"/>\n".         "       <input type=\"text\" name=\"dot1q\"/>\n".         "       <input type=\"text\" name=\"subnethost\"/>\n".         "       <input type=\"text\" name=\"ipv6subnethost\"/>\n".         "       <input type=\"text\" name=\"slotport\"/>\n".         "       <input type=\"text\" name=\"cmtsgwnode\"/>\n".         "       <input type=\"text\" name=\"slotport1\"/>\n".         "       <input type=\"text\" name=\"ipv6subnethost1\"/>\n".         "       <input type=\"text\" name=\"subnethost1\"/>\n".         "       <input type=\"text\" name=\"dot1q1\"/>\n".         "       <input type=\"image\" src=\"images/add.png\" alt=\"add row\" class=\"update\" title=\"add row\">\n".         "</form></div>"; ?> <div> <br /> <b>legend:</b> <br /> <img alt="add" src="images/add.png"> add row after entering correct information.<br /> <img alt="update" src="images/update.png"> update row after editing it.<br /> <img alt "delete" src="images/delete.png"> delete row.<br /> <br />  <form method="get" action="http://<ip address removed>"> <button type="submit">back</button> </form>    </div> </body> </html> 

$row[sqluid] ought $row['sqluid'] , there several more build input elements.