CSS Max-Width problem in IE6

Looks like I posted this in the wrong thread…

I am using the MX4 theme and the max-width css tag associated with an image is not working with IE in OSX or Win… but works fine in Firefox… crossplatform…

Is there a work around someone has found?

Thanks

this is what i have tried in my header.php:
<style>
entry img {width:expression(if(this.clientWidth>300)this.width=300);}
</style>

and this is in my css:
.entry img {
background-color: #ffffff;
border: 1px solid #dddddd;
/*-moz-border-radius:5px;*/
padding: 4px;
max-width: 334px;
}