Help with this Script please

please all my mate , i do not know what's wrong with my script,just some one please look and recorrect my script .because all my attempts failed ,
here my script
<script type='text/javascript'>
/*<![CDATA[*/

if(abdtitle==undefined)

var abdtitle='Thank you for visiting our site. We noticed that you have an ad blocker enabled. Please disable it, or whitelist our site.'

if(abdbtn==undefined)

var abdbtn='Verify'

if(abddesc==undefined)

var abddesc='To enter our site....

Help with this Script please

from JavaScript http://ift.tt/2anTXSB
via IFTTT
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