@displaymath \leqalignno problem for pdf output

[Christopher Dimech]

I have been testing some more and we are getting some serious problems.
Have tried the following two constructs

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1. First Test - This works in html, but fails in pdf ($$ $$ are required)

@displaymath
\leqalignno{
   \int v(t)\, dt &= u(t) + C&[3.1]\cr
   \int v(t)\, dt &= u(t) + H&[3.2]\cr
}
@end displaymath

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2. This works it pdf, but does not show up in html (this is expected bahaviour)

@tex
$$\leqalignno{
   \int v(t)\, dt &= u(t) + C&[3.1]\cr
   \int v(t)\, dt &= u(t) + H&[3.2]\cr
}$$
@end tex