Insert html/js in db and edit

HI , sorry for english , hi want to save in my db a code like this :

PHP Code:

var uri = 'https://pippo.com' + new String (Math.random()).substring (2, 11);
                            document.write('<a href="pippo.com" target="_BLANK"><img src="'+uri+'" border=0></a>'); 


This is a js script , hi want treat it like simple text , booth insertion and edit .

To try , i insert directly this code in db but if i echo the code i see a clickable image .

How can i save it as simple text and show as simple text ?