Float drop problem in ie 6.0

[barbicanmum]

Hi
I am having a problem getting my pages to display properly in internet explorer 6.0. They are fine in all other browsers.
Dreamweaver is telling me it is a float drop problem.
The main content div is dropping below the bottom of the sidebar div.

An example of the page with the problem is...

<snip>

Code for my sidebar / container and main content divs is as follows-

.thrColFixHdr #mainContent {
margin-left: 180px;
padding-top: 10px;
padding-right: 10px;
padding-bottom: 10px;
padding-left: 20px;
font-family: Geneva, Arial, Helvetica, sans-serif;
font-size: 12px;
top: 10px;
line-height: 16px;
border-left-width: medium;
border-left-style: solid;
border-left-color: #ea530a;
color: #545454;
margin-right: 10px;
}

.thrColFixHdr #container {
width: 780px;
background: #FFFFFF;
margin: 0 auto;
border: medium solid #ea530a;
text-align: left;
}
.thrColFixHdr #sidebar1 {
float: left;
width: 150px;
background: #ffffff;
font-family: Geneva, Arial, Helvetica, sans-serif;
color: #545454;
padding-top: 0px;
padding-left: 15px;
font-size: 12px;
height: auto;
line-height: normal;
border-right-style: none;
border-top-style: none;
border-bottom-style: none;
border-left-style: none;
padding-right: 15px;
word-spacing: 1px;
}

I am new at this and all help would be VERY VERY MUCH APPRECIATED!
Also, does anyone have any idea of what percentage of users still use ie6.0? Am I completely wasting my time here?
Many thanks

[edited by: swa66 at 8:47 pm (utc) on June 22, 2009]
[edit reason] No personal links please see ToS and forum charter [/edit]

[jameshopkins]

We really need to see all the HTML and corresponding CSS to find the issue here.

Also, does anyone have any idea of what percentage of users still use ie6.0? Am I completely wasting my time here?

Your browser matrix _should_ be based specifically on the browsers hitting your site; although there are general stats out there, they are far too broad to make an informed decision as to what browsers your site should support. Also your demographic may include users that use a very different browser to another sites demographic.

You need to delve into your own site stats and see what percentage of your users are still using IE6, and make a decision based on that criteria.

[TenTonJim]

IE6 44%
our corp site 6 million visits a year reports 44% for IE6
~ egads!

[edited by: TenTonJim at 4:13 am (utc) on June 30, 2009]

[barbicanmum]

thanks everyone for your help. I have now fixed the problem.