W3C compliance issue

livewirewebsolutions
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W3C compliance issue with the following line.

<a href="http://visitor.r20.constantcontact.com/d.jsp?llr=u6nm85dab&p=oi&m=1103768205236" target="_blank"><img src="images/send.png" alt="send button" width="131" height="40" class="center"/></a>

I tested the page in the Validator link below.  You can see all the issues that are all appearing on line 152 of my page.  I received the code from constant contact.  How do I fix this as it's clearly not W3C compliant.

http://validator.w3.org/check?uri=http%3A%2F%2Fwww.livewirewebsolutions.com%2F&charset=%28detect+automatically%29&doctype=Inline&group=0&user-agent=W3C_Validator%2F1.3+http%3A%2F%2Fvalidator.w3.org%2Fservices
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Well, the validator clearly tells you that the problem is a non-escaped "&".  You can check the chart for URL encoding sequnces here: http://www.w3schools.com/tags/ref_urlencode.asp, but unless you have some serious regulatory compliance issues, I'd leave it be.
Developer & EE Moderator
Fellow 2018
Most Valuable Expert 2013
Commented:
Run the validator again.  This time check all the options and you can clean up with htmltidy.  The link converts to

<a href="http://visitor.r20.constantcontact.com/d.jsp?llr=u6nm85dab&amp;p=oi&amp;m=1103768205236" target="_blank"><img src="images/send.png" alt="send button" width="131" height="40" class="center"></a>

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and no validates
Most Valuable Expert 2011
Top Expert 2016

Commented:
Try using the HTML5 doctype declaration.  It looks to me like the validator is confused about a URL.  Not sure why, but maybe the experimental doctype will help it get past the issue.  The HTML looks valid to me.
Most Valuable Expert 2018
Distinguished Expert 2018

Commented:
On line 148, the querystring part of your Anchors href includes a couple of & symbols. For your document to validate you need to change those to &amp;

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