validator bug?

Greetings:

The attached HTML file failed the validator because
there was an "&" embedded in a single-quoted string
inside a double-quoted string of JavaScript that was
the value of an "onClick" attribute of a button.

-------------------------------------------------
Warning Line 1666 column 113: cannot generate system
identifier for general entity "ftype".
....('definemastercode_new.jsp?type=Form&ftype=1',
'New', 550, 450);" value="Ne..
---------------------------------------------------

It seems to me that no escaping should be necessary
inside such quoted strings from the HTML validator's
standpoint.

Thanks,

Randy Nichols

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