Pressing "send your message" on the contact form (http://www.mobiles24.co/contact) results in an error:

Call to undefined function mysql_escape_string() on line 20 in /home/mob24/public_html/live-contact.php
#0 {main}
Fatal error: Call to undefined function mysql_escape_string() on line 20 in /home/mob24/public_html/live-contact.php in [path]/vb/vb.php on line 286


I wanted to request you to delete my account, so please delete my account, thank you.