Code not working

I am trying to use most read news in home page So when i

use the text which is in BOLD below its not working

<?php popular_posts(‘prefix=<div class=”top_reads”><h5>What’s new</h5>

&suffix=

</div>&limit=5&output_template=

• <div><h6>{title}</h6></div><div class=”clear”></div>

&excluded_cats=3,6&no_text=true&age-direction=after&age-length=30&age-duration=day’); ?>

and when i replace that text without (‘) it works

<?php popular_posts(‘prefix=<div class=”top_reads”><h5>Most Read Stories</h5>

&suffix=

</div>&limit=5&output_template=

• <div><h6>{title}</h6></div><div class=”clear”></div>

&excluded_cats=3,6&no_text=true&age-direction=after&age-length=30&age-duration=day’); ?>

Can any one suggest me a solution