Random image in html web

I have a script which generates a gif with this order

DATE=$(date +"%s")
cp /var/www/on.gif /var/www/daemonstate$DATE.gif

Each time I execute, the filename changes. My problem is, when I try to put the gif file in my html web with

<img src="http://ift.tt/1CnjuUC + * + .gif">

the file does not appear, I know this is not the right syntax but I cannot find the right ones.