Acquia Marina themes, it dose not work well with IE6

To fix this you will need to remove the following from the style.css file that came w/ the theme:

div.block div.content {
  overflow: hidden;
}

I also tried using core themes, but the same problem was there.

Perhaps you should file a bug report / support request w/in the Nice Menus issue queue.

Perhaps you need to disable CSS aggregation in the Performance section of Drupal.

Admininster > Performance > scroll down to "Bandwidth optimizations" and under "Optimize CSS files:" select disabled.

http://contestpedia.com//admin/settings/performance

The screenshot attached indicates that the fix does work.

I can see that you did not remove the line from your style.css file as I had indicated in my comment above.
http://drupal.org/node/367407#comment-1231688

You need to remove line 834 - 836 in style.css

div.block div.content {
overflow:hidden;
}

I managed to get Nice Menus to work in most areas, but if I insert a nice menu to preface, it behaves like described here + the background is transparent.

I found these css rules:

#preface-wrapper {
  overflow: hidden;
}

#preface {
  background: #000 url('images/preface-wrapper-bg.png') repeat-x top;
}

which hide the nice menu and makes it transparent, but I'm not sure if I should remove them. I tried to override them in .block-nice_menus but the menu stays hidden and transparent.

@mErilainen - the preface styles that you posted do not match with the 6.x-1.9 version of this theme.
Please try the 6.x-1.9 version of this theme.

Below is what the preface styles are for the 6.x-1.9 version. As you can see they differ from what you posted.

/********************************/
/* PREFACE REGIONS */
/********************************/

#preface {
  background: #144A6E url('images/preface-wrapper-bg.png') repeat-x top;
  min-height: 24px;
  padding-left: 15px;    /* LTR */
}

#preface-wrapper {
  color: #fff;
  font-family: Myriad Pro, Myriad Web Pro Regular, Lucida Grande, Geneva, Trebuchet MS, sans-serif;
  font-size: 1.5em;
  margin: 0 auto;
  padding: 10px 0 8px 0;
  width: 960px;
}

/* correct button font size */
#preface-wrapper .form-submit {
  font-size: 0.6em;
}

#preface-wrapper #preface-first {
}

#preface-wrapper #preface-middle {
}

#preface-wrapper #preface-last {
}

#preface-wrapper.prefaces-1 div.column {
  float: left;    /* LTR */
  width: 100%;
}

#preface-wrapper.prefaces-2 div.column {
  display: inline;
  float: left;    /* LTR */
  margin: 0 14px;
  width: 47%;
}

#preface-wrapper.prefaces-3 div.column {
  display: inline;
  float: left;    /* LTR */
  margin: 0 14px;
  width: 30%;
} 

#preface-wrapper a:link,
#preface-wrapper a:visited {
  color: #fff;
  text-decoration: underline;
}

#preface-wrapper a:link:hover,
#preface-wrapper a:visited:hover {
  border-bottom: none;
  text-decoration: none;
}

div.content > a:link img {
  border-bottom: none;
  margin: 0;
  padding: 0;
}

Recently we experienced an alignment issue when trying to implement the "nolink" feature in the primary menu. The expanded menus go out of alignment in IE.

An example of the problem can be found here. http://sandbox.chamberpot.org/

Thanks in advance for any guidance.

in ie6,the front-size is so little,what can i do?

in ie6,the front-size is so little,what can i do?

in ie6,the front-size is so little,what can i do?

in ie6,the front-size is so little,what can i do?

in ie6,the front-size is so little,what can i do?

in ie6,the front-size is so little,what can i do?

lau,

you can adjust the font size in the ie6 specific style sheet.