Double quotes within php script echo
You need to escape "
, so it won't be interpreted as end of string. Use \
to escape it:
echo "<script>$('#edit_errors').html('<h3><em><font color=\"red\">Please Correct Errors Before Proceeding</font></em></h3>')</script>";
Read more: strings and escape sequences
use a HEREDOC, which eliminates any need to swap quote types and/or escape them:
echo <<<EOL
<script>$('#edit_errors').html('<h3><em><font color="red">Please Correct Errors Before Proceeding</font></em></h3>')</script>
EOL;
Just escape your quotes:
echo "<script>$('#edit_errors').html('<h3><em><font color=\"red\">Please Correct Errors Before Proceeding</font></em></h3>')</script>";