Dynamic notice

How to use the expression correctly:

To use JS expressions put them in these tags: {# and #}.+

{# if (data.uni_cpo_width > 100) { print 'The width is too big!'; } #}

I have…

{# if (data.uni_cpo_szerokoscokna1 > 1000) {print ‘The width is too big!’; } #}

After saving it does not work, when I try to edit it I have

{# if (data.uni_cpo_szerokoscokna1 & gt; 1000) {print ‘The width is too big!’; } #}

Is this a coding mysql problem?
Maybe some screen, where and how should it be saved?